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[PATCH] xfs: silence GCC warning

To: Ben Myers <bpm@xxxxxxx>, Alex Elder <elder@xxxxxxxxxx>
Subject: [PATCH] xfs: silence GCC warning
From: Paul Bolle <pebolle@xxxxxxxxxx>
Date: Fri, 02 Nov 2012 11:10:21 +0100
Cc: xfs@xxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>
Building xfs_ioctl.o triggers this GCC warning:
    In file included from fs/xfs/xfs_linux.h:49:0,
                     from fs/xfs/xfs.h:27,
                     from fs/xfs/xfs_ioctl.c:18:
    fs/xfs/xfs_ioctl.c: In function ‘xfs_find_handle’:
    include/linux/file.h:37:7: warning: ‘f.file’ may be used uninitialized in 
this function [-Wmaybe-uninitialized]
    fs/xfs/xfs_ioctl.c:73:13: note: ‘f.file’ was declared here

In this function 'f' and ('f.file') are only used for the
XFS_IOC_FD_TO_HANDLE command. It is clear that 'f.file' is always used
initialized, but there appears to be no easy way to give GCC enough
information to determine that. So let's silence this warning, using the
pattern Ingo Molnar recently suggested.

Signed-off-by: Paul Bolle <pebolle@xxxxxxxxxx>
0) Compile tested only.

1) I fear that the only way to give GCC the information it needs to do
the flow analysis correctly is to split xfs_find_handle() into three
separate functions, one for each command it handles, and add one or two
helper functions for the code common to all three functions. That seemed
a bit drastic. But perhaps we should try that.

 fs/xfs/xfs_ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 8305f2a..5c98ce3 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -70,7 +70,7 @@ xfs_find_handle(
        int                     hsize;
        xfs_handle_t            handle;
        struct inode            *inode;
-       struct fd               f;
+       struct fd               f = { }; /* Avoid GCC warning */
        struct path             path;
        int                     error;
        struct xfs_inode        *ip;

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