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Re: [PATCH/RFC] Reduce call chain length in netfilter

To: "David S. Miller" <davem@xxxxxxxxxxxxx>
Subject: Re: [PATCH/RFC] Reduce call chain length in netfilter
From: Bart De Schuymer <bdschuym@xxxxxxxxxx>
Date: Thu, 27 Jan 2005 22:16:04 +0100
Cc: Patrick McHardy <kaber@xxxxxxxxx>, netdev@xxxxxxxxxxx, netfilter-devel@xxxxxxxxxxxxxxxxxxx, snort2004@xxxxxxx, rusty@xxxxxxxxxxxxxxx, ak@xxxxxxx, bridge@xxxxxxxx, gandalf@xxxxxxxxxxxxxx, dwmw2@xxxxxxxxxxxxx, shemminger@xxxxxxxx
In-reply-to: <20050127114726.2205b4ed.davem@xxxxxxxxxxxxx>
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Sender: netdev-bounce@xxxxxxxxxxx
Op do, 27-01-2005 te 11:47 -0800, schreef David S. Miller:
> On Thu, 27 Jan 2005 18:50:50 +0100
> Patrick McHardy <kaber@xxxxxxxxx> wrote:
> >  From what I can see it doesn't generate tail-calls currently:
> Indeed... It even doesn't do this on Sparc64 either, even for
> the okfn(skb) call which I was sure it would.
> It won't tail-call for function pointers for some strance reason
> as exhibited by this simple test:
> struct sk_buff {
>       int foo;
> };
> int invoke(struct sk_buff *skb, int (*okfn)(struct sk_buff *))
> {
>       return okfn(skb);
> }
> extern int test_func(struct sk_buff *);
> int invoke2(struct sk_buff *skb)
> {
>       return test_func(skb);
> }
> In the generated asm on sparc64, invoke2() gets a tail-call
> whereas invoke() does not.  Hmmm...

Pasha (<snort2004@xxxxxxx>) is currently using a bridge-nf patch vs
2.4.29 with the changes I sent to you. After two days he sent me
(yesterday) a message that all is well. Without the patch he was getting
the stack overflow oopses.


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