fs/buffer.c: change type of max_buffer_heads to unsigned long
authorZhang Yanfei <zhangyanfei@cn.fujitsu.com>
Sat, 23 Feb 2013 00:35:46 +0000 (16:35 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sun, 24 Feb 2013 01:50:22 +0000 (17:50 -0800)
max_buffer_heads is calculated from nr_free_buffer_pages(), so change
its type to unsigned long in case of overflow.

Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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