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Revert "[PATCH] mm: micro optimise zone_watermark_ok"

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This reverts commit e80ee884ae.

Pawel Sikora had a boot-time oops due to it - because the sign change
invalidates the following comparisons, since 'free_pages' can be
negative.

The micro-optimization just isn't worth it.

Bisected-by: Pawel Sikora <pluto@agmk.net>
Acked-by: Andrew Morton <akpm@osdl.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2007-01-31 16:43:36 -08:00
parent f56df2f4db
commit 6fd6b17c6d
1 changed files with 1 additions and 2 deletions
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3
mm/page_alloc.c
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@ -989,8 +989,7 @@ int zone_watermark_ok(struct zone *z, int order, unsigned long mark,
int classzone_idx, int alloc_flags)
{
/* free_pages my go negative - that's OK */
unsigned long min = mark;
long free_pages = z->free_pages - (1 << order) + 1;
long min = mark, free_pages = z->free_pages - (1 << order) + 1;
int o;
if (alloc_flags & ALLOC_HIGH)