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From: Hiep Nguyen <HNguyen@PacificDigital.com>
To: "'kdb@oss.sgi.com'" <kdb@oss.sgi.com>
Subject: Kernel 2.4.20-8: Problem with patching
Date: Tue, 6 Apr 2004 14:27:53 -0700 
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I tried to patch the kernel as instructed in the IBM's tutorial
http://www-106.ibm.com/developerworks/opensource/library/l-kdbug/ and got
the following:
 
Patching file kernel/ksyms.c
Reversed (or previously applied) patch detected! Assume -R? [n]
What do I do?
 
Thanks,
 
Hiep
 
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Subject: Re: Kernel 2.4.20-8: Problem with patching 
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On Tue, 6 Apr 2004 14:27:53 -0700 , 
Hiep Nguyen <HNguyen@PacificDigital.com> wrote:
>I tried to patch the kernel as instructed in the IBM's tutorial
>http://www-106.ibm.com/developerworks/opensource/library/l-kdbug/ and got
>the following:
> 
>Patching file kernel/ksyms.c
>Reversed (or previously applied) patch detected! Assume -R? [n]
>What do I do?

Which kernel were you patching?  Which patch were you applying?

> 
>The contents of this e-mail message, including any attachments, are intended
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>Pacific Digital Corporation http://www.PacificDigital.com
><http://www.pacificdigital.com/>  
> 
>The contents of this e-mail message, including any attachments, are intended solely for the use of the person or entity to whom the e-mail was addressed and is confidential. If you are not the intended recipient of this message, be advised that any dissemination, distribution, or use of the contents of this message is strictly prohibited. If you received this e-mail message in error, please e-mail webmaster@pacificdigital.com and contact the sender by reply e-mail. Please also permanently delete all copies of the original e-mail and any attached documentation. Thank you. Pacific Digital Corporation

Get rid of that disclaimer when you send to maling lists.  Mailing
lists are not confidential, your disclaimer just annoys people.

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From kstansel@us.ibm.com Thu Apr 15 12:19:17 2004
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While compiling a KDB kernel with the KDB modules built into the kernel, I 
am receiving errors in kdbm_pg.c.  I have traced this down
and kdbm_pg.c is expecting page->list to be part of the page structure. In 
the 2.6.5 kernel it does exist, but the latest prepatch 2.6.6-rc1
removes this from the page struct.
Is their a 2.6.6-rc1 kdb patch available, or are they only released when 
2.6.6 goes official?  Thanks!


diff -Nru a/include/linux/mm.h b/include/linux/mm.h
--- a/include/linux/mm.h        Wed Apr 14 18:36:06 2004
+++ b/include/linux/mm.h        Wed Apr 14 18:36:06 2004
@@ -180,9 +180,8 @@
        page_flags_t flags;             /* atomic flags, some possibly
                                           updated asynchronously */
        atomic_t count;                 /* Usage count, see below. */
-       struct list_head list;          /* ->mapping has some page lists. 
*/




Regards,

Kevin Stansell
Software Engineer
NOS Technology
919-543-1314    t/l: 441-1314
Email: kstansel@us.ibm.com



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From kaos@sgi.com Thu Apr 15 15:37:14 2004
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On Thu, 15 Apr 2004 15:18:58 -0400, 
Kevin Stansell <kstansel@us.ibm.com> wrote:
>While compiling a KDB kernel with the KDB modules built into the kernel, I 
>am receiving errors in kdbm_pg.c.  I have traced this down
>and kdbm_pg.c is expecting page->list to be part of the page structure. In 
>the 2.6.5 kernel it does exist, but the latest prepatch 2.6.6-rc1
>removes this from the page struct.
>Is their a 2.6.6-rc1 kdb patch available, or are they only released when 
>2.6.6 goes official?  Thanks!

Normally only when the official release comes out.  I assume that
anybody tracking -pre or -rc releases will know enough about the kernel
to fix problems like this themselves, and send patches to the list
(hint, hint).

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From linas@austin.ibm.com Fri Apr 16 13:44:09 2004
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From: linas@austin.ibm.com
To: anton@samba.org
Cc: kdb@oss.sgi.com, linuxppc64-dev@lists.linuxppc.org, ananth@in.ibm.com,
        nitin@in.ibm.com
Subject: [PATCH] fix crash in kdba bt command
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Anton,

Please apply attached patch to ameslab.  Note, this is just the first,
there will probably be some more patches coming in the next few days.

This patch fixes a minor bug in th backtrace command; bt <addr>
was failing to actually trace the stack at addr.

--linas



-- Attached file included as plaintext by Ecartis --

--- kdba_bt.c.orig	2004-04-16 14:45:44.000000000 -0500
+++ kdba_bt.c	2004-04-16 15:29:42.000000000 -0500
@@ -126,7 +126,7 @@ kdba_bt_stack_ppc(struct pt_regs *regs, 
 	if (!addr)
 		addr = (kdb_machreg_t *)p->thread.ksp;
 
-	if (addr && !task_curr(p)) {
+	if (addr && (!p || !task_curr(p))) {
 		eip = 0;
 		esp = *addr;
 		ebp = 0;
@@ -183,7 +183,8 @@ kdba_bt_stack_ppc(struct pt_regs *regs, 
 		/*		kdbnearsym(eip, &symtab); */
 		kdba_find_tb_table(eip, &tbtab); 
 
-		/*		sym = symtab.sym_name ? &symtab : &tbtab.symtab; *//* use fake symtab if necessary */
+		/* sym = symtab.sym_name ? &symtab : &tbtab.symtab; */
+		/* use fake symtab if necessary */
 		name = NULL;
 		if (esp >= PAGE_OFFSET) { 
 			/*if ((sym) )*/ 
@@ -288,8 +289,8 @@ kdba_bt_stack(struct pt_regs *regs, kdb_
 /*
  * kdba_bt_address
  *
- *	Do a backtrace starting at a specified stack address.  Use this if the
- *	heuristics get the i386 stack decode wrong.
+ *	Do a backtrace starting at a specified stack address.  Handy
+ *	if the stack is somwhere unexpected/unusual.
  *
  * Inputs:
  *	addr	Address provided to 'bt' command.
@@ -300,9 +301,6 @@ kdba_bt_stack(struct pt_regs *regs, kdb_
  *	zero for success, a kdb diagnostic if error
  * Locking:
  *	none.
- * Remarks:
- *	mds %esp comes in handy when examining the stack to do a manual
- *	traceback.
  */
 
 int


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Date: Fri, 16 Apr 2004 17:22:06 -0500
From: linas@austin.ibm.com
To: anton@samba.org
Cc: olh@suse.de, kdb@oss.sgi.com, linuxppc64-dev@lists.linuxppc.org,
        ananth@in.ibm.com, nitin@in.ibm.com
Subject: [PATCH] stop debugger recursion when multiple resets caught.
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Hi Anton,

Please apply the following patch to Ameslab.  It fixes one of the
most serious KDB problems at this time: incorrect handling of 
recursive calls into the debugger from unexpected exceptions.

For example, hitting the little yellow button repeatedly is currently
causing all sorts of havoc in KDB, as are some other, more bizarre
circumstances.  This patch should fix these.  

--linas



-- Attached file included as plaintext by Ecartis --

--- arch/ppc64/kdb/kdbasupport.c.orig	2004-04-16 16:15:17.000000000 -0500
+++ arch/ppc64/kdb/kdbasupport.c	2004-04-16 17:11:56.000000000 -0500
@@ -1789,7 +1789,7 @@ kdb_debugger(struct pt_regs *regs) {
 	} else { /* regs invalid */
 		kdb(KDB_REASON_SILENT,0,regs);
 	}
-	return 0;
+	return 1;
 }
 
 int
--- arch/ppc64/kernel/traps.c.orig	2004-04-16 16:20:16.000000000 -0500
+++ arch/ppc64/kernel/traps.c	2004-04-16 16:26:09.000000000 -0500
@@ -171,13 +171,26 @@ SystemResetException(struct pt_regs *reg
 #endif
 
 	if (!debugger(regs))
+	{
 		die("System Reset", regs, 0);
 
+		/* We should issue a shutdown or hard reset here. */
+	}
+
 	/* Must die if the interrupt is not recoverable */
-	if (!(regs->msr & MSR_RI))
+	if (!(regs->msr & MSR_RI)) {
 		panic("Unrecoverable System Reset");
 
-	/* What should we do here? We could issue a shutdown or hard reset. */
+		/* We should issue a shutdown or hard reset here. */
+	}
+
+	/* What should we do here? We might be tempted to issue a shutdown 
+	 * or hard reset, but that would be wrong.  The reason we go here
+	 * is because er hit the little yellow button a bunch of times,
+	 * while already being in the debugger.  The debugger just wants
+	 * these events to go away, be ignored, and that is exactly what
+	 * we should do.  The user has other mechanisms for hard reboot,
+	 * if that's what they really wanted to do. */
 }
 
 #ifdef CONFIG_PPC_PSERIES


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From: Olaf Hering <olh@suse.de>
To: linas@austin.ibm.com
Cc: anton@samba.org, kdb@oss.sgi.com, linuxppc64-dev@lists.linuxppc.org,
        ananth@in.ibm.com, nitin@in.ibm.com
Subject: Re: [PATCH] stop debugger recursion when multiple resets caught.
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 On Fri, Apr 16, linas@austin.ibm.com wrote:

> 
> Hi Anton,
> 
> Please apply the following patch to Ameslab.  It fixes one of the
> most serious KDB problems at this time: incorrect handling of 
> recursive calls into the debugger from unexpected exceptions.
> 
> For example, hitting the little yellow button repeatedly is currently
> causing all sorts of havoc in KDB, as are some other, more bizarre
> circumstances.  This patch should fix these.  
> 
> --linas
> 

> --- arch/ppc64/kdb/kdbasupport.c.orig	2004-04-16 16:15:17.000000000 -0500
> +++ arch/ppc64/kdb/kdbasupport.c	2004-04-16 17:11:56.000000000 -0500
> @@ -1789,7 +1789,7 @@ kdb_debugger(struct pt_regs *regs) {
>  	} else { /* regs invalid */
>  		kdb(KDB_REASON_SILENT,0,regs);
>  	}
> -	return 0;
> +	return 1;
>  }

Thanks Linas,

I have added this part.


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sUse lINUX ag, nÃœRNBERG

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Subject: is this what you were looking for
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From wiuehyo@legislator.com Sun Apr 18 07:45:10 2004
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Date: Mon, 19 Apr 2004 02:20:42 +1000
From: Anton Blanchard <anton@samba.org>
To: linas@austin.ibm.com
Cc: olh@suse.de, kdb@oss.sgi.com, linuxppc64-dev@lists.linuxppc.org,
        ananth@in.ibm.com, nitin@in.ibm.com
Subject: Re: [PATCH] stop debugger recursion when multiple resets caught.
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> Please apply the following patch to Ameslab.  It fixes one of the
> most serious KDB problems at this time: incorrect handling of 
> recursive calls into the debugger from unexpected exceptions.
> 
> For example, hitting the little yellow button repeatedly is currently
> causing all sorts of havoc in KDB, as are some other, more bizarre
> circumstances.  This patch should fix these.  

Applied.

Anton
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From: Anton Blanchard <anton@samba.org>
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> Please apply attached patch to ameslab.  Note, this is just the first,
> there will probably be some more patches coming in the next few days.
> 
> This patch fixes a minor bug in th backtrace command; bt <addr>
> was failing to actually trace the stack at addr.

Thanks Linas, applied.

Anton
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From ananth@in.ibm.com Mon Apr 19 06:50:56 2004
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From: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
To: kdb@oss.sgi.com
Cc: kaos@sgi.com
Subject: Race in kdb()
Message-ID: <20040419145008.GA13342@in.ibm.com>
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Hi,

While working on KDB for ppc64, I hit a race in kdb(). Verified that the
problem exists on x86 too..

Problem occurs when a bp is set on a very frequently hit routine (eg., 
sys_read() or schedule()), and multiple processors hit the bp 
simultaneously. This is the problem I am seeing...

        CPU0                            CPU1
         |                               |
        kdb(reason = break)              |
         |                               |
         |                               |
        spin_lock()                      |
         |                               |
        kdb_initial_cpu = 0;             |
         |                               |
        spin_unlock()                    |
         ..                       kdb(reason = break)
         |                               |
         |                      if (reason != KDB_REASON_SWITCH) {
         |                      if (KDB_IS_RUNNING() && !KDB_STATE(REENTRY))
         |                              <is true>
	 |				....
         |                               
         |
        smp_kdb_stop();


Thanks,
Ananth
-- 
Ananth Narayan
Linux Technology Center,
IBM Software Lab, INDIA

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From xavier.bru@bull.net Mon Apr 19 08:51:12 2004
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Date: Mon, 19 Apr 2004 17:52:20 +0200
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References: <20040419145008.GA13342@in.ibm.com>
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Ananth N Mavinakayanahalli wrote:

>Hi,
>
>While working on KDB for ppc64, I hit a race in kdb(). Verified that the
>problem exists on x86 too..
>
>Problem occurs when a bp is set on a very frequently hit routine (eg., 
>sys_read() or schedule()), and multiple processors hit the bp 
>simultaneously. This is the problem I am seeing...
>
>        CPU0                            CPU1
>         |                               |
>        kdb(reason = break)              |
>         |                               |
>         |                               |
>        spin_lock()                      |
>         |                               |
>        kdb_initial_cpu = 0;             |
>         |                               |
>        spin_unlock()                    |
>         ..                       kdb(reason = break)
>         |                               |
>         |                      if (reason != KDB_REASON_SWITCH) {
>         |                      if (KDB_IS_RUNNING() && !KDB_STATE(REENTRY))
>         |                              <is true>
>	 |				....
>         |                               
>         |
>        smp_kdb_stop();
>
>
>Thanks,
>Ananth
>  
>
Hi, Ananth, Keith & all,

Problem also exists on ia64, and becomes more serious when number of 
cpus is important.

-- 

 Sincères salutations.
_____________________________________________________________________
 
Xavier BRU                 BULL ISD/R&D/INTEL office:     FREC B1-422
tel : +33 (0)4 76 29 77 45                    http://www-frec.bull.fr
fax : +33 (0)4 76 29 77 70                 mailto:Xavier.Bru@bull.net
addr: BULL, 1 rue de Provence, BP 208, 38432 Echirolles Cedex, FRANCE
_____________________________________________________________________


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From kaos@sgi.com Mon Apr 19 20:12:50 2004
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From: Keith Owens <kaos@sgi.com>
To: ananth@in.ibm.com
Cc: kdb@oss.sgi.com
Subject: Re: Race in kdb() 
In-reply-to: Your message of "Mon, 19 Apr 2004 19:50:08 +0500."
             <20040419145008.GA13342@in.ibm.com> 
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On Mon, 19 Apr 2004 19:50:08 +0500, 
Ananth N Mavinakayanahalli <ananth@in.ibm.com> wrote:
>Hi,
>
>While working on KDB for ppc64, I hit a race in kdb(). Verified that the
>problem exists on x86 too..
>
>Problem occurs when a bp is set on a very frequently hit routine (eg., 
>sys_read() or schedule()), and multiple processors hit the bp 
>simultaneously. This is the problem I am seeing...
>
>        CPU0                            CPU1
>         |                               |
>        kdb(reason = break)              |
>         |                               |
>         |                               |
>        spin_lock()                      |
>         |                               |
>        kdb_initial_cpu = 0;             |
>         |                               |
>        spin_unlock()                    |
>         ..                       kdb(reason = break)
>         |                               |
>         |                      if (reason != KDB_REASON_SWITCH) {
>         |                      if (KDB_IS_RUNNING() && !KDB_STATE(REENTRY))
>         |                              <is true>
>	 |				....
>         |                               
>         |
>        smp_kdb_stop();

I know.  Fixing this trace requires significant changes to the way that
breakpoints are handled and will break kdb for all architectures.  It
is on my list for kdb v5.0.

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From Marco.Caverzaghi@italtel.it Fri Apr 23 08:54:12 2004
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Date: Fri, 23 Apr 2004 17:37:46 +0200
From: Marco Caverzaghi <Marco.Caverzaghi@italtel.it>
Organization: Italtel S.p.A.
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Subject: Two questions about KDB portability
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Dear SGI Open Source,

I'm interested in KDB Open Source Project.
I've a question about the architecture portability of KDB: does it run
on the PowerPc architecture, Motorola PQII-MPC8280
processor ?
And another question about the Linux kernel portability of KDB: does it
run on Vanilla 2.6.4 kernel ?

Thanks in advance,
Best Regards,

Marco Caverzaghi
System Engineer
Italtel SPA

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From kaos@sgi.com Fri Apr 23 18:17:56 2004
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From: Keith Owens <kaos@sgi.com>
To: Marco Caverzaghi <Marco.Caverzaghi@italtel.it>
Cc: kdb@oss.sgi.com
Subject: Re: Two questions about KDB portability 
In-reply-to: Your message of "Fri, 23 Apr 2004 17:37:46 +0200."
             <4089384A.BF6CB9E9@italtel.it> 
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On Fri, 23 Apr 2004 17:37:46 +0200, 
Marco Caverzaghi <Marco.Caverzaghi@italtel.it> wrote:
>I'm interested in KDB Open Source Project.
>I've a question about the architecture portability of KDB: does it run
>on the PowerPc architecture, Motorola PQII-MPC8280
>processor ?

There are versions of kdb for PPC, but not on this list.  The PPC
maintainers add kdb to their own tree, please ask on the PPC mailing
lists.

>And another question about the Linux kernel portability of KDB: does it
>run on Vanilla 2.6.4 kernel ?

Yes, for i386.

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Date: Thu, 29 Apr 2004 11:43:29 -0500
From: linas@austin.ibm.com
To: kaos@sgi.com, kdb@oss.sgi.com
Cc: ananth@in.ibm.com
Subject: [ananth@in.ibm.com: [PATCH] Compile kdb modules without error]
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FYI,

This patch is against powerpc64 ameslab tree, but I thought 
an FYI to the KDB mailing list would be appropriate.  It fixes 
generic KDB bits due to kernel-2.6.6-rc* changes to struct file 
and struct inode.  Some mangled version of this patch is needed 
for the SGI KDB sources.

--linas

----- Forwarded message from Ananth N Mavinakayanahalli <ananth@in.ibm.com> -----

Date: Thu, 29 Apr 2004 18:04:12 +0500
From: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
To: anton@samba.org
Cc: linuxppc64-dev@lists.linuxppc.org, linas@austin.ibm.com
Subject: [PATCH] Compile kdb modules without error
Reply-To: ananth@in.ibm.com
User-Agent: Mutt/1.4i

Hi Anton,

Sometime during the linux-2.6.6-rc* series, both struct file and 
struct inode were changed. Some routines in kdb modules files depend 
on the structure elements that no longer exist. Inlined is a patch
that circumvents this issue by disabling the routines that use the 
removed elements.

Will need to sync with upstream once SGI releases a patch for 
the 2.6.6 series. (Will send another patch when one is available).

This patch also contains updates to bring the "common" kdb code 
in ameslab up to date with the SGI released level (for 2.6.5).

Please apply...


Thanks,
Ananth


diff -Naur --exclude=BitKeeper --exclude=SCCS temp/ameslab/arch/ppc64/kdb/kdba_bp.c ameslab/arch/ppc64/kdb/kdba_bp.c
--- temp/ameslab/arch/ppc64/kdb/kdba_bp.c	2004-04-23 10:22:09.000000000 +0530
+++ ameslab/arch/ppc64/kdb/kdba_bp.c	2004-04-29 16:29:35.000000000 +0530
@@ -169,9 +169,9 @@
 				KDB_STATE_CLEAR(DOING_SSB);
 				KDB_STATE_CLEAR(DOING_SS);
 			} else {
-				char *argv[] = {"ssb", NULL};
+				const char *argv[] = {"ssb", NULL};
 				rv = KDB_DB_SSB; /* Indicate ssb - dismiss immediately */
-				kdb_ss(0, (char **)argv, NULL, ef);
+				kdb_ss(0, argv, NULL, ef);
 			}
 		} else {
 			/*
diff -Naur --exclude=BitKeeper --exclude=SCCS temp/ameslab/drivers/char/sn_serial.c ameslab/drivers/char/sn_serial.c
--- temp/ameslab/drivers/char/sn_serial.c	2004-04-23 10:22:35.000000000 +0530
+++ ameslab/drivers/char/sn_serial.c	2004-04-29 15:38:52.000000000 +0530
@@ -309,11 +309,13 @@
 		if (kdb_on) {
 			if (ch == *kdb_serial_ptr) {
 				if (!(*++kdb_serial_ptr)) {
+					spin_unlock_irqrestore(&sn_sal_lock, *flags);
 					if (!regs)
 						KDB_ENTER();	/* to get some registers */
 					else
 						kdb(KDB_REASON_KEYBOARD, 0, regs);
 					kdb_serial_ptr = (char *)kdb_serial_str;
+					spin_lock_irqsave(&sn_sal_lock, *flags);
 					break;
 				}
 			}
diff -Naur --exclude=BitKeeper --exclude=SCCS temp/ameslab/include/linux/kdb.h ameslab/include/linux/kdb.h
--- temp/ameslab/include/linux/kdb.h	2004-04-23 10:24:32.000000000 +0530
+++ ameslab/include/linux/kdb.h	2004-04-29 14:53:20.000000000 +0530
@@ -39,6 +39,7 @@
 #include <linux/config.h>
 #include <linux/init.h>
 #include <linux/sched.h>
+#include <asm/atomic.h>
 #include <asm/kdb.h>
 
 #define KDB_MAJOR_VERSION	4
@@ -55,6 +56,7 @@
 #else
 #define KDB_IS_RUNNING() (0)
 #endif	/* CONFIG_KDB */
+extern atomic_t kdb_event;
 
 	/*
 	 * kdb_on
diff -Naur --exclude=BitKeeper --exclude=SCCS temp/ameslab/kdb/ChangeLog ameslab/kdb/ChangeLog
--- temp/ameslab/kdb/ChangeLog	2004-04-23 10:24:41.000000000 +0530
+++ ameslab/kdb/ChangeLog	2004-04-29 14:20:18.000000000 +0530
@@ -1,3 +1,33 @@
+2004-04-11 Keith Owens  <kaos@sgi.com>
+
+	* Unlock sn_sal_lock before entering kdb from sn_serial.
+	* kdb v4.3-2.6.5-common-2.
+
+2004-04-05 Keith Owens  <kaos@sgi.com>
+
+	* kdb v4.3-2.6.5-common-1.
+
+2004-03-22 Keith Owens  <kaos@sgi.com>
+
+	* kdb v4.3-2.6.5-rc2-common-1.
+
+2004-03-12 Keith Owens  <kaos@sgi.com>
+
+	* More work to avoid spurious messages from WARN_CONSOLE_UNLOCKED().
+	* bh command bug fixes.  Nathan Scott.
+	* kdb v4.3-2.6.4-common-1.
+
+2004-03-06 Keith Owens  <kaos@sgi.com>
+
+	* Set KDB_IS_RUNNING() during kdb_init to avoid spurious messages from
+	  WARN_CONSOLE_UNLOCKED().
+	* Correct loss of symbol names in kdbnearsym.
+	* kdb v4.3-2.6.4-rc2-common-1.
+
+2004-02-29 Keith Owens  <kaos@sgi.com>
+
+	* kdb v4.3-2.6.4-rc1-common-1.
+
 2004-02-21 Keith Owens  <kaos@sgi.com>
 
 	* Correct build of kdb_cmds when using a separate object directory and
@@ -841,562 +871,3 @@
 	* include/linux/kdbprivate.h: add kdb_initial_cpu.
 
 	* include/linux/kdb.h: add kdb_on, bump version to kdb v1.4.
-2002-11-02 Keith Owens  <kaos@sgi.com>
-
-	* Upgrade to 2.5.45.
-	* Correct build without CONFIG_KDB.
-	* kdb v2.4-2.5.45-common-1.
-
-2002-11-01 Keith Owens  <kaos@sgi.com>
-
-	* Sync with kdb v2.4-2.4.19-common-2.
-	* Add defcmd/endefcmd feature.
-	* Remove kdb_eframe_t.
-	* Clear bp data before using.
-	* Sanity check if we have pt_regs.
-	* Force LINES > 1.
-	* Remove special case for KDB_REASON_PANIC, use KDB_ENTER() instead.
-	* Remove kdba_getcurrentframe().
-	* Coexist with O(1) scheduler.
-	* Add lines option to dmesg, speed up dmesg.
-	* Add selection critera to ps and bta commands.
-	* New man page, Documentation/kdb/kdb_sr.man.
-	* kdb v2.4-2.5.44-common-1.
-
-2002-10-25 Keith Owens  <kaos@sgi.com>
-
-	* Move -fomit-frame-pointer after .config has been read.
-	* Upgrade to 2.5.44.
-	* kdb v2.3-2.5.44-common-1.
-
-2002-10-17 Keith Owens  <kaos@sgi.com>
-
-	* Upgrade to 2.5.43.
-	* kdb v2.3-2.5.43-common-1.
-
-2002-10-14 Keith Owens  <kaos@sgi.com>
-
-	* Upgrade to 2.5.42.
-	* kdb v2.3-2.5.42-common-1.
-
-2002-10-09 Keith Owens  <kaos@sgi.com>
-
-	* Upgrade to 2.5.41.
-	* kdb v2.3-2.5.41-common-1.
-
-2002-10-04 Keith Owens  <kaos@sgi.com>
-
-	* Minimize differences between patches for 2.4 and 2.5 kernels.
-	* Reduce stack usage.
-	* kdb v2.3-2.5.40-common-2.
-
-2002-10-03 Keith Owens  <kaos@sgi.com>
-
-	* Upgrade to 2.5.40.
-	* kdb v2.3-2.5.40-common-1.
-
-2002-09-24 Keith Owens  <kaos@sgi.com>
-
-	* Sync with kdb v2.3-2.4.19-common-2.
-	* Sync with 2.5.x-xfs (2.5.38).
-	* Replace kdb_port with kdb_serial to support memory mapped I/O.
-	  David Mosberger.
-	* Remove individual SGI copyrights, the general SGI copyright applies.
-	* Handle md0.  Reported by Hugh Dickins, different fix by Keith Owens.
-	* Use page_address() in kdbm_pg.c.  Hugh Dickins.
-	* Remove debugging printk from kdbm_pg.c.  Hugh Dickins.
-	* Move breakpoint address verification into arch dependent code.
-	* Dynamically resize kdb command table as required.
-	* Common code to support USB keyboard.  Sebastien Lelarge.
-	  Note: broken in 2.5 until somebody who understands USB can fix it.
-	* Add dmesg command.
-	* Clean up copyrights, Eric Sandeen.
-	* Syntax check mdWcN commands.
-
-2002-02-27 Keith Owens <kaos@sgi.com>
-
-	* Tom Duffy's kdb for 2.5.5.
-	* Sync with kdb v2.1-2.4.18-common-1.
-	* Correct kdbm_pg.c for non-highmem machines.
-	* kdb v2.1-2.5.5-common-1.
-
-2002-02-26 Keith Owens <kaos@sgi.com>
-
-	* Upgrade to 2.4.18.
-	* Add Paul Dorwin (IBM) magicpoint slides on using kdb as
-	  Documentation/kdb/slides.
-	* kdb v2.1-2.4.18-common-1.
-
-2002-01-23 Keith Owens <kaos@sgi.com>
-
-	* Sync with XFS pagebuf changes.
-	* kdb v2.1-2.4.17-common-2.
-
-2002-01-18 Keith Owens <kaos@sgi.com>
-
-	* Ignore single stepping during panic.
-	* Remove kdba_getword, kdba_putword.  Replace with kdb_getword,
-	  kdb_putword that rely on copy_xx_user.  The new functions return
-	  an error code, like copy_xx_user.
-	* New functions kdb_getarea, kdb_putarea for copying areas of data
-	  such as structures.  These functions also return an error code.
-	* Change all common code to use the new functions.
-	* bp command checks that it can read and write the word at the
-	  breakpoint before accepting the address.
-	* Break points are now set FIFO and cleared LIFO so overlapping
-	  entries give sensible results.
-	* Verify address before disassembling code.
-	* Common changes for sparc64.  Ethan Solomita, Tom Duffy.
-	* Remove ss <count>, never supported.
-	* Remove kallsyms entries from arch vmlinux.lds files.
-	* Specify which commands auto repeat.
-	* kdb v2.1-2.4.17-common-1.
-
-2002-01-07 Keith Owens <kaos@sgi.com>
-
-	* Remove console semaphore code, not good in interrupt.
-	* Remove fragment of ia64 patch that had crept into kdb.
-	* Release as kdb v2.0-2.4.17-common-3.
-
-2002-01-04 Keith Owens  <kaos@sgi.com>
-
-	* Sync xfs <-> kdb common code.
-
-2001-12-22 Keith Owens  <kaos@sgi.com>
-
-	* Upgrade to 2.4.17.
-	* Clean up ifdef CONFIG_KDB.
-	* Add ifdef CONFIG_KDB around include kdb.h.
-	* Delete dummy kdb.h files for unsupported architectures.
-	* Delete arch i386 and ia64 specific files.  This changelog now
-	  applies to kdb common code only.
-	* Release as kdb v2.0-2.4.17-common-1.
-
-2001-12-03 Keith Owens  <kaos@sgi.com>
-
-	* Upgrade to 2.4.16.
-	* Add include/asm-um/kdb.h stub to allow XFS to be tested under UML.
-	* Check if an interrupt frame on i386 came from user space.
-	* Out of scope bug fix in kdb_id.c.  Ethan Solomita.
-	* Changes to common code to support sparc64.  Ethan Solomita.
-	* Change GFP_KERNEL to GFP_ATOMIC in disasm.  Ethan Solomita.
-
-2001-11-16 Keith Owens  <kaos@sgi.com>
-
-	* Upgrade to 2.4.15-pre5.
-	* Wrap () around #define expressions with unary operators.
-
-2001-11-13 Keith Owens  <kaos@sgi.com>
-
-	* Upgrade to 2.4.15-pre4.
-	* kbdm_pg.c patch from Hugh Dickins.
-
-2001-11-07 Keith Owens  <kaos@sgi.com>
-
-	* Upgrade to 2.4.14-ia64-011105.
-	* Change name of l1 serial I/O routine, add ia64 init command.  SGI.
-	* Sync kdbm_pg with XFS.
-
-2001-11-06 Keith Owens  <kaos@sgi.com>
-
-	* Upgrade to kernel 2.4.14.
-
-2001-11-02 Keith Owens  <kaos@sgi.com>
-
-	* Sync kdbm_pg.c with XFS.
-
-2001-10-24 Keith Owens  <kaos@sgi.com>
-
-	* Upgrade to kernel 2.4.13.
-
-2001-10-14 Keith Owens  <kaos@melbourne.sgi.com>
-
-	* More use of TMPPREFIX in top level Makefile to speed up NFS compiles.
-
-	* Correct repeat calculations in md/mds commands.
-
-2001-10-10 Keith Owens  <kaos@melbourne.sgi.com>
-
-	* Copy bfd.h and ansidecl.h to arch/$(ARCH)/kdb, remove dependecies on
-	  user space includes.
-
-	* Update kdb v1.9 to kernel 2.4.11.
-
-2001-10-01 Keith Owens  <kaos@melbourne.sgi.com>
-
-	* Update kdb v1.9 to kernel 2.4.11-pre1 and 2.4.10-ac1.
-
-	* Correct loop in kdb_parse, reported by Tachino Nobuhiro.
-
-2001-09-25 Keith Owens  <kaos@melbourne.sgi.com>
-
-	* Update kdb v1.8 to kernel 2.4.10.
-
-	* kdbm_pg patch from Hugh Dickens.
-
-	* DProbes patch from Bharata B Rao.
-
-	* mdWcn and mmW patch from Vamsi Krishna S.
-
-	* i386 disasm layout patch from Jean-Marc Saffroy.
-
-	* Work around for 64 bit binutils, Simon Munton.
-
-	* kdb.mm doc correction by Chris Pascoe.
-
-	* Enter repeats the last command, IA64 disasm only prints one
-	  instruction.  Don Dugger.
-
-	* Allow kdb/modules to be linked into vmlinux.
-
-	* Remove obsolete code from kdb/modules/kdbm_{pg,vm}.c.
-
-	* Warn when commands are entered at more prompt.
-
-	* Add MODULE_AUTHOR, DESCRIPTION, LICENSE.
-
-	* Release as kdb v1.9.
-
-2001-02-27 Keith Owens  <kaos@melbourne.sgi.com>
-
-	* Update kdb v1.8 to kernel 2.4.2, sync kdb/modules with XFS.
-
-	* Hook into panic() call.
-
-2000-12-18 Keith Owens  <kaos@melbourne.sgi.com>
-
-	* Update kdb v1.7 to kernel 2.4.0-test13-pre3, sync kdb/modules with
-	XFS.
-
-2000-11-18 Keith Owens  <kaos@melbourne.sgi.com>
-
-	* Update to kernel 2.4.0-test11-pre7, including forward port of
-	bug fixes from WIP 2.4.0-test9 tree.
-
-	* Update to Cygnus CVS trees for disassembly code.
-
-	* Bump to kdb v1.6.
-
-2000-10-19 Keith Owens  <kaos@melbourne.sgi.com>
-
-	* Update to kernel 2.4.0-test10-pre4.
-
-2000-10-15 Keith Owens  <kaos@melbourne.sgi.com>
-
-	* kdb/kdbmain.c (kdb_parse): Correctly handle blank input.
-
-	* kdb/kdbmain.c (kdb_local, kdb): Reason SILENT can have NULL regs.
-
-2000-10-13 Keith Owens  <kaos@melbourne.sgi.com>
-
-	* kdb/kdbmain.c: Reduce CMD_LEN to avoid overflowing kdb_printf buffer.
-
-2000-10-11 Keith Owens  <kaos@melbourne.sgi.com>
-
-	* kdb/kdbmain.c (kdb): Test for userspace breakpoints before driving
-	  other cpus into kdb.  Speeds up gdb and avoids SMP race.
-
-	* arch/i386/kdb/kdba_io.c (get_serial_char, get_kbd_char): Ignore
-	  unprintable characters.
-
-	* arch/i386/kdb/kdba_io.c (kdba_read): Better handling of buffer size.
-
-2000-10-04 Keith Owens  <kaos@melbourne.sgi.com>
-
-	* arch/i386/kdb/kdba_bt.c (kdba_bt_process): Verify that esp is inside
-	task_struct.  Original patch by Mike Galbraith.
-
-	* kdb/kdb_io.c (kdb_getstr): Reset output line counter, remove
-	unnecessary prompts.
-
-	* arch/i386/kdb/kdbasupport.c (kdb_getregcontents): Change " cs" to
-	"xcs", ditto ss, ds, es.  gdb2kdb does not like leading spaces.
-
-	* include/asm-xxx/kdb.h: Add dummy kdb.h for all architectures except
-	ix86.  This allows #include <linux/kdb.h> to appear in arch independent
-	code without causing compile errors.
-
-	* kdb/modules/kdbm_pg: Sync with XFS.
-
-2000-10-03  Keith Owens  <kaos@melbourne.sgi.com>
-
-	* kdb/kdb_io.c (kdb_read): Ignore NMI while waiting for input.
-
-	* kdb/kdb_io.c, kdb/Makefile: Export kdb_read.
-
-2000-10-02  Keith Owens  <kaos@melbourne.sgi.com>
-
-	* arch/i386/kernel/smpboot.c (do_boot_cpu): Set nmi_watchdog_source to 2
-	to avoid premature NMI oops during cpu bring up.  We have to assume that
-	a box with more than 1 cpu has a working IO-APIC.
-
-	* Documentation/kdb/{kdb.mm,kdb_md.man}: Add mdr command.
-
-	* kdb/kdbmain.c (kdb_md): Add mdr command.
-
-	* Release as kdb v1.5 against 2.4.0-test9-pre8.
-
-	* arch/i386/kdb/kdba_io.c, arch/i386/kdb/kdbasupport.c, kdb/kdbmain.c,
-	kdb/kdb_io.c, kdb/kdb_id.c: Remove zero initializers for static
-	variables.
-
-2000-09-28  Keith Owens  <kaos@melbourne.sgi.com>
-
-	* various: Add nmi_watchdog_source, 1 local APIC, 2 IO-APIC.
-	Test nmi_watchdog_source instead of nr_ioapics so UP works on SMP hardware.
-
-	* arch/i386/kernel/io_apic.c: Rename setup_nmi to setup_nmi_io for clarity.
-
-	* kdb/kdbmain.c (kdb_parse): Only set NO_WATCHDOG if it was already set.
-
-	* kdb/kdbmain.c (kdb): Clear NO_WATCHDOG on all exit paths.
-
-	* include/linux/kdb.h: Add KDB_REASON_SILENT.
-
-	* kdb/kdbmain.c (kdb_local): Treat reason SILENT as immediate 'go'.
-
-	* kdb/kdbmain.c (kdb_init): Invoke kdb with reason SILENT to instantiate
-	any breakpoints on boot cpu.
-
-	* arch/i386/kernel/smpboot.c (smp_callin): Invoke kdb with reason SILENT
-	to instantiate any global breakpoints on this cpu.
-
-	* kdb/kdb_cmds: Remove comment that said initial commands only worked on
-	boot cpu.
-
-2000-09-27  Keith Owens  <kaos@melbourne.sgi.com>
-
-	* arch/i386/kernel/msr.c: Move {rd,wr}msr_eio to include/asm-i386/apic.h.
-
-	* include/asm-i386/apic.h: Define NMI interfaces.
-
-	* kernel/sysctl.c (kern_table):
-	* kernel/sysctl.c (do_proc_set_nmi_watchdog):
-	Add /proc/sys/kernel/nmi_watchdog.
-
-	* arch/i386/kernel/apic.c: New routines set_nmi_counter_local,
-	setup_apic_nmi_watchdog.
-
-	* arch/i386/kernel/traps.c: New routine set_nmi_watchdog().  Call apic
-	routines to set/clear local apic timer.
-
-2000-09-26  Keith Owens  <kaos@melbourne.sgi.com>
-
-	* include/linux/sysctl.h (enum): Add NMI_WATCHDOG.
-
-	* arch/i386/kernel/traps.c (nmi_watchdog_tick): Check nmi_watchdog is
-	still on.
-
-	* arch/i386/config.in: Add CONFIG_UP_NMI_WATCHDOG.
-
-	* Documentation/Configure.help: Add CONFIG_UP_NMI_WATCHDOG.
-
-	* Documentation/nmi_watchdog.txt: Update for UP NMI watchdog.
-
-2000-09-25  Keith Owens  <kaos@melbourne.sgi.com>
-
-	* arch/i386/kernel/apic.c (init_apic_mappings):
-	* arch/i386/kernel/io_apic.c (IO_APIC_init_uniprocessor):
-	Merge Keir Fraser's local APIC for uniprocessors patch.
-
-2000-09-24  Keith Owens  <kaos@melbourne.sgi.com>
-
-	* Various: Declare initialization routines as __init.
-
-	* Makefile: Define and export AWK.
-
-	* kdb/Makefile: Generate gen-kdb_cmds.c from kdb/kdb_cmds.
-
-	* kdb/kdbmain.c (kdb_init): Call new routine kdb_cmds_init to execute
-	whatever the user put in kdb/kdb_cmds.
-
-	* arch/i386/kdb/kdba_bt.c (kdba_bt_stack): New parameter to
-	indicate if esp in regs is known to be valid or not.
-
-	* kdb/kdb_bp.c, arch/i386/kdb/kdba_bp.c: More trace prints for
-	breakpoint handling.
-
-	* arch/i386/kdb/kdba_bp.c (kdba_installbp): Finally found and fixed the
-	annoying breakpoint bug where breakpoints where not always installed
-	after 'go'.
-
-	* Documentation/kdb: Update man pages kdb.mm, kdb_env.man, kdb_ss.man.
-
-	* Released as kdb-v1.5-beta1-2.4.0-test8.
-
-	* Sync to 2.4.0-test9-pre6 and release as kdb-v1.5-beta1-2.4.0-test9-pre6.
-
-2000-09-23  Keith Owens  <kaos@melbourne.sgi.com>
-
-	* arch/i386/kdb/kdbasupport.c (kdba_getregcontents): New pseudo
-	registers cesp and ceflags to help with debugging the debugger.
-
-	* kdb/kdbmain.c (kdb_local, kdb): Add KDB_REASON_RECURSE.  Add
-	environment variable RECURSE.  Add code to cope with some types of
-	recursion.
-
-	* kdb/kdbmain.c (kdb), arch/i386/kdba/kdba_bp.c: Add
-	kdba_clearsinglestep.
-
-2000-09-22  Keith Owens  <kaos@melbourne.sgi.com>
-
-	* drivers/video/vgacon.c (write_vga): No cli() if kdb is running, avoid
-	console deadlock.
-
-	* arch/i386/kernel/irq.c (get_irqlock): Warn if kdb is running, may hang.
-
-	* include/linux/kdb.h: Define KDB_IS_RUNNING as (0) if no CONFIG_KDB.
-
-	* arch/i386/kdb/kdba_bt.c (kdba_bt_stack): Do not attempt a backtrace if
-	the code segment is not in the kernel.
-
-	* kdb/modules: Change modules from MX_OBJS to M_OBJS.  Remove EXPORT_NOSYMBOLS.
-
-2000-09-21  Keith Owens  <kaos@melbourne.sgi.com>
-
-	* arch/i386/kernel/i386_ksyms.c: Move EXPORT_SYMBOLS for kdb to kdb/kdbmain.c.
-
-	* kdb/Makefile: Change kdb/kdbmain.o from O_OBJS to OX_OBJS.
-
-	* arch/i386/kernel/smp.c: Remove some #ifdef CONFIG_KDB.  Remove kdbprivate.h.
-
-	* include/linux/kdb.h: Add kdb_print_state.  Add KDB_STATE_WAIT_IPI.
-
-	* kdb/kdbmain.c (kdb): Only mark cpu as leaving if it is in KDB state.  Maintain
-	WAIT_IPI state so a cpu is only driven through NMI once.
-
-	* arch/i386/kernel/smp.c (smp_kdb_stop): All state fiddling moved to kdb().
-
-2000-09-20  Keith Owens  <kaos@melbourne.sgi.com>
-
-	* include/linux/kdb.h: #define kdb() as (0) if kdb is not configured.
-
-	* arch/i386/kernel/traps.c: Remove some #ifdef CONFIG_KDB.
-
-	* include/linux/kdbprivate.h: Move per cpu state to kdb.h.
-
-	* include/linux/kdb.h: Add KDB_STATE_NO_WATCHDOG, KDB_STATE_PRINTF_LOCK.
-	Rename KDB_DEBUG_xxx to KDB_DEBUG_FLAG_xxx.  Clean up debug flag
-	definitions.
-
-	* arch/i386/kernel/traps.c (nmi_watchdog_tick): Check no watchdog.
-
-	* kdb/kdbmain.c (kdb): Set no watchdog in normal kdb code.
-
-	* kdb/kdbmain.c (kdb_parse): Allow watchdog in commands.
-
-	* kdb/kdb_io.c (kdb_printf): No watchdog during printing.  Clean up lock handling.
-
-	* kdb/kdbmain.c (kdb_set): Clean up debug flag handling.
-
-2000-09-19  Juan J. Quintela  <quintela@fi.udc.es>
-
-	* kdb/arch/i386/kdb/kdba_io.c: Allow kdb to compile without CONFIG_VT and/or
-	serial console.
-
-2000-09-19  Keith Owens  <kaos@melbourne.sgi.com>
-
-	* include/linux/kdb.h: Define KDB_DEBUG_STATE().
-
-	* kdb/kdbmain.c (kdb): Add kdb_print_state(), calls to KDB_DEBUG_STATE().
-
-2000-09-16  Keith Owens  <kaos@melbourne.sgi.com>
-
-	* Move to finer grained control over individual processors in kdb with
-	per cpu kdb state.  Needed to allow ss[b] to only release one processor,
-	previously ss[b] released all processors.  Also need to recover from
-	errors inside kdb commands, e.g. oops in kdbm_pg code.
-
-	* various:
-	  Move global flags KDB_FLAG_SSB, KDB_FLAG_SUPRESS, KDB_FLAG_FAULT,
-	  KDB_FLAG_SS, KDB_FLAG_SSBPT, kdb_active, to per cpu state and macros
-	  KDB_STATE(xxx).
-	  Replace kdb_flags & KDB_FLAG_xxx with KDB_FLAG(xxx).
-	  Replace kdb_flags & KDB_DEBUG_xxx with KDB_DEBUG(xxx).
-	  Replace specific tests with wrapper KDB_IS_RUNNING().
-
-	* various: Remove #ifdef CONFIG_SMP from kdb code wherever
-	possible.  Simplifies the code and makes it much more readable.
-
-	* arch/i386/kdb/kdbasupport.c (kdb_setjmp): Record if we have reliable
-	longjmp data instead of assuming it is always set.
-
-	* various: Replace smp_kdb_wait with per cpu state, HOLD_CPU.
-
-	* init/main.c : Replace #ifdef KDB_DEBUG with KDB_DEBUG(CALLBACK).
-
-	* include/linux/kdbprivate.h: Separate command return codes from error
-	codes.  Add more detailed command codes.
-
-	* arch/i386/kernel/traps.c (die): Change spin_lock_irq to
-	spin_lock_irqsave.  Why did I do this?
-
-	* kdb/kdbmain.c (kdb_parse): Set per cpu flag CMD before executing kdb
-	command.  More detailed return codes for commands that affect
-	processors.
-
-	* kdb/kdbmain.c (kdb_previous_event): New, check if any processors are
-	still executing the previous kdb event.  Removes a race window where a
-	second event could enter kdb before the first had completely ended.
-
-	* kdb/kdbmain.c (kdb): Document all the concurrency conditions and how
-	kdb handles them.  ss[b] now releases only the current cpu.  Do not set
-	breakpoints when releasing for ss[b].  Recover from errors in kdb
-	commands.  Check that we have reliable longjmp data before using it.
-
-	* various: Update return code documentation.
-
-	* kdb/kdb_bp.c (kdb_ss): Separate ss and ssb return codes.
-
-	* kdb/kdbsupport.c (kdb_ipi): Finer grained algorithm for deciding
-	whether to call send a stop signal to a cpu.
-
-	* arch/i386/kdb/kdba_bp.c (kdba_db_trap): Separate ss and ssb return
-	codes.  Reinstall delayed software breakpoints per cpu instead of
-	globally.  Changed algorithm for handling ss[b].
-
-	* arch/i386/kdb/kdba_bp.c (kdba_bp_trap): Match software breakpoints per
-	cpu instead of globally.
-
-	* include/linux/kdb.h: Bump version to kdb v1.5.
-
-2000-09-16  Keith Owens  <kaos@melbourne.sgi.com>
-
-	* kernel/sysctl.c (kern_table): add /proc/sys/kernel/kdb.
-
-	* init/main.c (parse_options): add boot flags kdb=on, kdb=off,
-	kdb=early.
-
-	* include/linux/sysctl.h (enum): add KERN_KDB.
-
-	* drivers/char/serial.c (receive_chars): check kdb_on.
-
-	* drivers/char/keyboard.c (handle_scancode): check kdb_on.
-
-	* arch/i386/kernel/traps.c (nmi_watchdog_tick): check kdb_on.
-
-	* arch/i386/config.in: add CONFIG_KDB_OFF.
-
-	* Documentation/Configure.help: add CONFIG_KDB_OFF.
-
-	* kdb/kdbmain.c: add kdb_initial_cpu, kdb_on.
-
-	* kdb/kdbmain.c (kdb): check kdb_on, set kdb_initial_cpu.
-
-	* kdb/kdbmain.c (kdb_init): add Keith Owens to kdb banner.
-
-	* kdb/kdb_io.c (kdb_printf): serialize kdb_printf output.
-
-	* kdb/kdb_bt.c (kdb_bt): check environment variable BTAPROMPT.
-
-	* kdb/kdbsupport.c (kdb_ipi): ignore NMI for kdb_initial_cpu.
-
-	* kdb/modules/kdbm_pg.c (kdbm_page): merge updates from 2.4.0-test5-xfs.
-
-	* kdb/kdb_bt.man: add btp, bta, BTAPROMPT.
-
-	* kdb/kdb.mm: add CONFIG_KDB_OFF, boot flags, btp, bta.
-
-	* include/linux/kdbprivate.h: add kdb_initial_cpu.
-
-	* include/linux/kdb.h: add kdb_on, bump version to kdb v1.4.
diff -Naur --exclude=BitKeeper --exclude=SCCS temp/ameslab/kdb/gen-kdb_cmds.c ameslab/kdb/gen-kdb_cmds.c
--- temp/ameslab/kdb/gen-kdb_cmds.c	2004-04-23 10:24:41.000000000 +0530
+++ ameslab/kdb/gen-kdb_cmds.c	1970-01-01 05:30:00.000000000 +0530
@@ -1,4 +0,0 @@
-#include <linux/init.h>
-char __initdata *kdb_cmds[] = {
-  0
-};
diff -Naur --exclude=BitKeeper --exclude=SCCS temp/ameslab/kdb/kdb_cmds ameslab/kdb/kdb_cmds
--- temp/ameslab/kdb/kdb_cmds	2004-04-23 10:24:41.000000000 +0530
+++ ameslab/kdb/kdb_cmds	2004-04-29 14:20:18.000000000 +0530
@@ -4,9 +4,3 @@
 # registers) are not reliable this early.  set and bp commands should
 # be safe.  Global breakpoint commands affect each cpu as it is booted.
 
-# Initial commands for kdb, alter to suit your needs.
-# These commands are executed in kdb_init() context, no SMP, no
-# processes.  Commands that require process data (including stack or
-# registers) are not reliable this early.  set and bp commands should
-# be safe.  Global breakpoint commands affect each cpu as it is booted.
-
diff -Naur --exclude=BitKeeper --exclude=SCCS temp/ameslab/kdb/kdb_io.c ameslab/kdb/kdb_io.c
--- temp/ameslab/kdb/kdb_io.c	2004-04-23 10:24:41.000000000 +0530
+++ ameslab/kdb/kdb_io.c	2004-04-29 14:20:19.000000000 +0530
@@ -498,6 +498,7 @@
 		KDB_STATE_SET(PRINTF_LOCK);
 		spin_lock(&kdb_printf_lock);
 		got_printf_lock = 1;
+		atomic_inc(&kdb_event);
 	}
 
 	diag = kdbgetintenv("LINES", &linecount);
@@ -597,6 +598,7 @@
 		got_printf_lock = 0;
 		spin_unlock(&kdb_printf_lock);
 		KDB_STATE_CLEAR(PRINTF_LOCK);
+		atomic_dec(&kdb_event);
 	}
 	if (do_longjmp)
 #ifdef KDB_HAVE_LONGJMP
diff -Naur --exclude=BitKeeper --exclude=SCCS temp/ameslab/kdb/kdbmain.c ameslab/kdb/kdbmain.c
--- temp/ameslab/kdb/kdbmain.c	2004-04-23 10:24:42.000000000 +0530
+++ ameslab/kdb/kdbmain.c	2004-04-29 14:42:51.000000000 +0530
@@ -69,6 +69,7 @@
 	 */
 volatile int kdb_flags;
 volatile int kdb_enter_debugger;
+atomic_t kdb_event;
 
 	/*
 	 * kdb_lock protects updates to kdb_initial_cpu.  Used to
@@ -219,7 +220,7 @@
  * with '\' in strings.  CML2 would have been able to do it but we lost CML2.
  * KAO.
  */
-// const char kdb_serial_str[] = "\001";
+/* const char kdb_serial_str[] = "\001"; */
 const char kdb_serial_str[] = "startKDB";
 
 /*
@@ -1678,9 +1679,10 @@
 {
 	kdb_intstate_t	int_state;	/* Interrupt state */
 	kdb_reason_t	reason2 = reason;
-	int		result = 1;	/* Default is kdb handled it */
+	int		result = 0;	/* Default is kdb did not handle it */
 	int		ss_event;
 	kdb_dbtrap_t 	db_result=KDB_DB_NOBPT;
+	atomic_inc(&kdb_event);
 
 	switch(reason) {
 	case KDB_REASON_OOPS:
@@ -1699,7 +1701,7 @@
 		KDB_FLAG_SET(ONLY_DO_DUMP);
 	}
 	if (!kdb_on && !KDB_FLAG(ONLY_DO_DUMP))
-		return 0;
+		goto out;
 
 	KDB_DEBUG_STATE("kdb 1", reason);
 	KDB_STATE_CLEAR(SUPPRESS);
@@ -1730,7 +1732,7 @@
 	if ((reason == KDB_REASON_BREAK || reason == KDB_REASON_DEBUG)
 	 && db_result == KDB_DB_NOBPT) {
 		KDB_DEBUG_STATE("kdb 2", reason);
-		return 0;	/* Not one of mine */
+		goto out;	/* Not one of mine */
 	}
 
 	/* Turn off single step if it was being used */
@@ -1807,12 +1809,12 @@
 			}
 			if (!recover) {
 				kdb_printf("     Cannot recover, allowing event to proceed\n");
-				return(0);
+				goto out;
 			}
 		}
 	} else if (!KDB_IS_RUNNING()) {
 		kdb_printf("kdb: CPU switch without kdb running, I'm confused\n");
-		return(0);
+		goto out;
 	}
 
 	/*
@@ -1982,7 +1984,9 @@
 	KDB_STATE_CLEAR(RECURSE);
 	KDB_STATE_CLEAR(LEAVING);	/* No more kdb work after this */
 	KDB_DEBUG_STATE("kdb 17", reason);
-	return(result != 0);
+out:
+	atomic_dec(&kdb_event);
+	return result != 0;
 }
 
 /*
@@ -3475,6 +3479,7 @@
 void __init
 kdb_init(void)
 {
+	kdb_initial_cpu = smp_processor_id();
 	/*
 	 * This must be called before any calls to kdb_printf.
 	 */
@@ -3501,7 +3506,8 @@
 	if (!kdbjmpbuf)
 		printk(KERN_ERR "Cannot allocate kdbjmpbuf, no kdb recovery will be possible\n");
 #endif	/* KDB_HAVE_LONGJMP */
-	
+
+	kdb_initial_cpu = -1;
 }
 
 int kdb_getuserarea_size(void *to, unsigned long from, size_t size);
diff -Naur --exclude=BitKeeper --exclude=SCCS temp/ameslab/kdb/kdbsupport.c ameslab/kdb/kdbsupport.c
--- temp/ameslab/kdb/kdbsupport.c	2004-04-23 10:24:42.000000000 +0530
+++ ameslab/kdb/kdbsupport.c	2004-04-29 14:20:19.000000000 +0530
@@ -162,7 +162,8 @@
 	unsigned long symbolsize;
 	unsigned long offset;
 	static char *knt[100];	/* kdb name table, arbitrary size */
-	char *knt1 = kmalloc(128, GFP_ATOMIC);
+#define knt1_size 128		/* must be >= kallsyms table size */
+	char *knt1 = kmalloc(knt1_size, GFP_ATOMIC);
 
 	if (!knt1) {
 		kdb_printf("kdbnearsym: addr=0x%lx cannot kmalloc knt1\n", addr);
@@ -176,10 +177,21 @@
 	symtab->sym_name = kallsyms_lookup(addr, &symbolsize , &offset, (char **)(&symtab->mod_name), knt1);
 	symtab->sym_start = addr - offset;
 	symtab->sym_end = symtab->sym_start + symbolsize;
-	ret = (symtab->sym_name != 0);
+	ret = symtab->sym_name != NULL && *(symtab->sym_name) != '\0';
 
-	if (symtab->sym_name) {
+	if (ret) {
 		int i;
+		/* Another 2.6 kallsyms "feature".  Sometimes the sym_name is
+		 * set but the buffer passed into kallsyms_lookup is not used,
+		 * so it contains garbage.  The caller has to work out which
+		 * buffer needs to be saved.
+		 *
+		 * What was Rusty smoking when he wrote that code?
+		 */
+		if (symtab->sym_name != knt1) {
+			strncpy(knt1, symtab->sym_name, knt1_size);
+			knt1[knt1_size-1] = '\0';
+		}
 		for (i = 0; i < ARRAY_SIZE(knt); ++i) {
 			if (knt[i] && strcmp(knt[i], knt1) == 0)
 				break;
@@ -191,6 +203,7 @@
 			kfree(knt1);
 			knt1 = knt[i];
 			memcpy(knt+i, knt+i+1, sizeof(knt[0])*(ARRAY_SIZE(knt)-i-1));
+			i = ARRAY_SIZE(knt) - 1;
 		}
 		knt[i] = knt1;
 		symtab->sym_name = knt[i];
diff -Naur --exclude=BitKeeper --exclude=SCCS temp/ameslab/kdb/modules/kdbm_pg.c ameslab/kdb/modules/kdbm_pg.c
--- temp/ameslab/kdb/modules/kdbm_pg.c	2004-04-23 10:24:42.000000000 +0530
+++ ameslab/kdb/modules/kdbm_pg.c	2004-04-29 15:55:03.000000000 +0530
@@ -118,7 +118,7 @@
 	kdb_printf("  bno %llu size %d dev 0x%x\n",
 		(unsigned long long)bh.b_blocknr,
 		bh.b_size,
-		bh.b_bdev->bd_dev);
+		bh.b_bdev ? bh.b_bdev->bd_dev : 0);
 	kdb_printf("  count %d state 0x%lx [%s]\n",
 		bh.b_count.counter, bh.b_state,
 		map_flags(bh.b_state, bh_state_vals));
@@ -181,9 +181,12 @@
 		return(diag);
 
 	kdb_printf("struct page at 0x%lx\n", addr);
-	kdb_printf("  next 0x%p prev 0x%p addr space 0x%p index %lu (offset 0x%x)\n",
+/*	kdb_printf("  next 0x%p prev 0x%p addr space 0x%p index %lu (offset 0x%x)\n",
 		   page.list.next, page.list.prev, page.mapping, page.index,
-		   (int)(page.index << PAGE_CACHE_SHIFT));
+		   (int)(page.index << PAGE_CACHE_SHIFT)); */
+	kdb_printf("  addr space 0x%p index %lu (offset 0x%x)\n",
+		   page.mapping, page.index,
+		   (int)(page.index << PAGE_CACHE_SHIFT)); 
 	kdb_printf("  count %d flags %s\n",
 		   page.count.counter, page_flags(page.flags));
 	kdb_printf("  virtual 0x%p\n", page_address((struct page *)addr));
@@ -273,7 +276,7 @@
 	return 0;
 }
 
-
+/* routine not used currently.. sync with upstream later
 static void
 do_buffer(unsigned long addr)
 {
@@ -286,7 +289,9 @@
 		 (unsigned long long)bh.b_blocknr,
 		 map_flags(bh.b_state, bh_state_vals));
 }
+*/
 
+/* inode_struct changed in 2.6.6-rc series.. sync with upstream later
 static int
 kdbm_inode_pages(int argc, const char **argv, const char **envp,
 	struct pt_regs *regs)
@@ -386,6 +391,7 @@
 		kfree(ap);
 	return diag;
 }
+*/
 
 static int
 kdbm_inode(int argc, const char **argv, const char **envp,
@@ -566,7 +572,8 @@
 	kdb_register("inode", kdbm_inode, "<vaddr>", "Display inode", 0);
 	kdb_register("sb", kdbm_sb, "<vaddr>", "Display super_block", 0);
 	kdb_register("bh", kdbm_buffers, "<buffer head address>", "Display buffer", 0);
-	kdb_register("inode_pages", kdbm_inode_pages, "<inode *>", "Display pages in an inode", 0);
+/* inode struct changed in 2.6.6-rc series.. sync with upstream later
+	kdb_register("inode_pages", kdbm_inode_pages, "<inode *>", "Display pages in an inode", 0); */
 	kdb_register("req", kdbm_request, "<vaddr>", "dump request struct", 0);
 	kdb_register("rqueue", kdbm_rqueue, "<vaddr>", "dump request queue", 0);
 #if	defined(CONFIG_X86) | defined(CONFIG_PPC64)
diff -Naur --exclude=BitKeeper --exclude=SCCS temp/ameslab/kdb/modules/kdbm_task.c ameslab/kdb/modules/kdbm_task.c
--- temp/ameslab/kdb/modules/kdbm_task.c	2004-04-23 10:24:42.000000000 +0530
+++ ameslab/kdb/modules/kdbm_task.c	2004-04-29 14:21:07.000000000 +0530
@@ -71,7 +71,7 @@
 	int		nextarg;
 	int		e = 0;
 	struct task_struct *tp = NULL;
-
+	
 	if (argc != 1)
 		return KDB_ARGCOUNT;
 
@@ -146,7 +146,7 @@
 	int		e = 0;
 	int		i;
 	char		fmt[32];
-
+	
 	if (argc != 1)
 		return KDB_ARGCOUNT;
 
@@ -186,7 +186,7 @@
 {
 	kdb_register("task", kdbm_task, "<vaddr>", "Display task_struct", 0);
 	kdb_register("sigset", kdbm_sigset, "<vaddr>", "Display sigset_t", 0);
-
+	
 	return 0;
 }
 
diff -Naur --exclude=BitKeeper --exclude=SCCS temp/ameslab/kernel/kallsyms.c ameslab/kernel/kallsyms.c
--- temp/ameslab/kernel/kallsyms.c	2004-04-23 10:24:42.000000000 +0530
+++ ameslab/kernel/kallsyms.c	2004-04-29 15:36:13.000000000 +0530
@@ -39,7 +39,13 @@
 
 static inline int is_kernel_text(unsigned long addr)
 {
-	if (addr >= (unsigned long)_stext && addr <= (unsigned long)_etext)
+	if (addr >= (unsigned long)_stext && addr <= 
+#ifdef CONFIG_KDB
+		(unsigned long)_end
+#else
+		(unsigned long)_edata
+#endif
+		)
 		return 1;
 	return 0;
 }

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From: Keith Owens <kaos@sgi.com>
To: Kevin Stansell <kstansel@us.ibm.com>
Cc: kdb@oss.sgi.com
Subject: Re: page->list 
In-reply-to: Your message of "Thu, 15 Apr 2004 15:18:58 -0400."
             <OF4AEADCFF.8F662AD4-ON85256E77.0066FAD7-85256E77.006A1B15@us.ibm.com> 
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On Thu, 15 Apr 2004 15:18:58 -0400, 
Kevin Stansell <kstansel@us.ibm.com> wrote:
>While compiling a KDB kernel with the KDB modules built into the kernel, I 
>am receiving errors in kdbm_pg.c.  I have traced this down
>and kdbm_pg.c is expecting page->list to be part of the page structure. In 
>the 2.6.5 kernel it does exist, but the latest prepatch 2.6.6-rc1
>removes this from the page struct.

Fixed in kdb-v4.3-2.6.6-rc1-common-1.  The i386 kdb code does not
handle backtrace using 4K stacks yet use 8K stacks for now.

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From: Keith Owens <kaos@sgi.com>
To: linas@austin.ibm.com
Cc: kdb@oss.sgi.com, ananth@in.ibm.com
Subject: Re: [ananth@in.ibm.com: [PATCH] Compile kdb modules without error] 
In-reply-to: Your message of "Thu, 29 Apr 2004 11:43:29 EST."
             <20040429114329.W58706@forte.austin.ibm.com> 
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On Thu, 29 Apr 2004 11:43:29 -0500, 
linas@austin.ibm.com wrote:
>This patch is against powerpc64 ameslab tree, but I thought 
>an FYI to the KDB mailing list would be appropriate.  It fixes 
>generic KDB bits due to kernel-2.6.6-rc* changes to struct file 
>and struct inode.  Some mangled version of this patch is needed 
>for the SGI KDB sources.

ftp://oss.sgi.com/projects/kdb/download/v4.3/kdb-v4.3-2.6.6-rc1-*.bz2
handles the new radix tree code in struct address_space and struct
page.

kdb for i386 will not handle backtrace when using 4K task structures.
Work in progress, use 8K stacks for now.

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