linux-kernel - [PATCH next 2/2] btrfs: extent-tree: Fix error format string

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Message-Id: <20191108213853.16635-3-afaerber@suse.de>
Date:   Fri,  8 Nov 2019 22:38:53 +0100
From:   Andreas Färber <afaerber@...e.de>
To:     Qu Wenruo <wqu@...e.com>, David Sterba <dsterba@...e.com>
Cc:     Johannes Thumshirn <jthumshirn@...e.de>, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        linux-btrfs@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH next 2/2] btrfs: extent-tree: Fix error format string

From: Andreas Färber <afaerber@...e.com>

sizeof() returns type size_t, thus we need %zu instead of %lu.

This fixes the following build warning on 32-bit arm:

  In file included from ../include/linux/printk.h:7,
                   from ../include/linux/kernel.h:15,
                   from ../include/asm-generic/bug.h:19,
                   from ../arch/arm/include/asm/bug.h:60,
                   from ../include/linux/bug.h:5,
                   from ../include/linux/thread_info.h:12,
                   from ../include/asm-generic/current.h:5,
                   from ./arch/arm/include/generated/asm/current.h:1,
                   from ../include/linux/sched.h:12,
                   from ../fs/btrfs/extent-tree.c:6:
  ../fs/btrfs/extent-tree.c: In function '__btrfs_free_extent':
  ../include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 8 has type 'unsigned int' [-Wformat=]
      5 | #define KERN_SOH "\001"  /* ASCII Start Of Header */
        |                  ^~~~~~
  ../include/linux/kern_levels.h:10:19: note: in expansion of macro 'KERN_SOH'
     10 | #define KERN_CRIT KERN_SOH "2" /* critical conditions */
        |                   ^~~~~~~~
  ../fs/btrfs/ctree.h:2986:24: note: in expansion of macro 'KERN_CRIT'
   2986 |  btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
        |                        ^~~~~~~~~
  ../fs/btrfs/extent-tree.c:3207:4: note: in expansion of macro 'btrfs_crit'
   3207 |    btrfs_crit(info,
        |    ^~~~~~~~~~
  ../fs/btrfs/extent-tree.c:3208:83: note: format string is defined here
   3208 | "invalid extent item size for key (%llu, %u, %llu) owner %llu, has %u expect >= %lu",
        |                                                                                 ~~^
        |                                                                                   |
        |                                                                                   long unsigned int
        |                                                                                 %u

Fixes: 0c171e9095e4 ("btrfs: extent-tree: Kill BUG_ON() in __btrfs_free_extent() and do better comment")
Cc: Qu Wenruo <wqu@...e.com>
Cc: David Sterba <dsterba@...e.com>
Signed-off-by: Andreas Färber <afaerber@...e.com>
---
 fs/btrfs/extent-tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 7c7a3e30e917..631c9743ddc7 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3205,7 +3205,7 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
 		struct btrfs_tree_block_info *bi;
 		if (unlikely(item_size < sizeof(*ei) + sizeof(*bi))) {
 			btrfs_crit(info,
-"invalid extent item size for key (%llu, %u, %llu) owner %llu, has %u expect >= %lu",
+"invalid extent item size for key (%llu, %u, %llu) owner %llu, has %u expect >= %zu",
 				   key.objectid, key.type, key.offset,
 				   owner_objectid, item_size,
 				   sizeof(*ei) + sizeof(*bi));
-- 
2.16.4