diff options
author | Yuri Tikhonov <yur@emcraft.com> | 2009-04-13 14:40:11 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-13 15:04:32 -0700 |
commit | 61609d01cbb3ab865c8cccaf85e6837c47096480 (patch) | |
tree | 144e176568328a6fcd9c01853c3f88fd6bc1a08e /fs/ubifs | |
parent | 347486bb108fa6e0fd2753c1be3519d6be2516ed (diff) |
shmem: fix division by zero
Fix a division by zero which we have in shmem_truncate_range() and
shmem_unuse_inode() when using big PAGE_SIZE values (e.g. 256kB on
ppc44x).
With 256kB PAGE_SIZE, the ENTRIES_PER_PAGEPAGE constant becomes too large
(0x1.0000.0000) on a 32-bit kernel, so this patch just changes its type
from 'unsigned long' to 'unsigned long long'.
Hugh: reverted its unsigned long longs in shmem_truncate_range() and
shmem_getpage(): the pagecache index cannot be more than an unsigned long,
so the divisions by zero occurred in unreached code. It's a pity we need
any ULL arithmetic here, but I found no pretty way to avoid it.
Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ubifs')
0 files changed, 0 insertions, 0 deletions