linux-kernel - Re: [GIT PULL] XFS update for 2.6.29

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Date:	Thu, 1 Jan 2009 12:03:29 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Lachlan McIlroy <lachlan@....com>,
	Christoph Hellwig <hch@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	xfs@....sgi.com, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] XFS update for 2.6.29

On Thu, Jan 01, 2009 at 10:50:52AM +0100, Geert Uytterhoeven wrote:
> | fs/xfs/xfs_btree.c: In function 'xfs_btree_readahead_lblock':
> | fs/xfs/xfs_btree.c:736: warning: comparison is always true due to limited range of data type
> | fs/xfs/xfs_btree.c:741: warning: comparison is always true due to limited range of data type
> 
> left/right = xfs_fsblock_t (32 or 64 bit), NULLDFSBNO = xfs_dfsbno_t (64 bit)

Hmm, can't reproduce it here with CONFIG_LBD=n on x86, but the following
patch should fix it:

Index: linux-2.6/fs/xfs/xfs_btree.c
===================================================================
--- linux-2.6.orig/fs/xfs/xfs_btree.c	2009-01-01 15:57:04.606547140 +0100
+++ linux-2.6/fs/xfs/xfs_btree.c	2009-01-01 15:57:24.780673454 +0100
@@ -730,8 +730,8 @@ xfs_btree_readahead_lblock(
 	struct xfs_btree_block	*block)
 {
 	int			rval = 0;
-	xfs_fsblock_t		left = be64_to_cpu(block->bb_u.l.bb_leftsib);
-	xfs_fsblock_t		right = be64_to_cpu(block->bb_u.l.bb_rightsib);
+	xfs_dfsbno_t		left = be64_to_cpu(block->bb_u.l.bb_leftsib);
+	xfs_dfsbno_t		right = be64_to_cpu(block->bb_u.l.bb_rightsib);
 
 	if ((lr & XFS_BTCUR_LEFTRA) && left != NULLDFSBNO) {
 		xfs_btree_reada_bufl(cur->bc_mp, left, 1);
--
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