Re: XFS warning in 2.6.18-rc4

From: Alexey Dobriyan
Date: Wed Aug 09 2006 - 19:03:42 EST

On Wed, Aug 09, 2006 at 11:04:53PM +0300, Meelis Roos wrote:
> fs/xfs/xfs_bmap.c: In function 'xfs_bmapi':
> fs/xfs/xfs_bmap.c:2662: warning: 'rtx' is used uninitialized in this function

gcc bug again? Corresponding preprocessed source when XFS realtime allocator
is off:

static int xfs_bmap_rtalloc(xfs_bmalloca_t *ap)
xfs_rtblock_t rtx;

if (ap->eof && ap->off == 0) {
===> error = (251); <===
if (error)
return error;
ap->rval = rtx * mp->m_sb.sb_rextsize;
} else {
ap->rval = 0;

This is the only place where rtx is "used".

When realtime allocator is on, xfs_rtpick_extent() is real function
either a) returning error and leaving garbage in "rtx", or b)
initializing "rtx" and returning 0.

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