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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-01-31 16:43:36 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-01-31 16:46:40 -0800
commit6fd6b17c6d9713f56b5f20903ec3e00fa6cc435e (patch)
treef5dd7477e48fc5a1184d3472548291397be9c2b5 /mm
parentLinux 2.6.20-rc7 (diff)
downloadlinux-dev-6fd6b17c6d9713f56b5f20903ec3e00fa6cc435e.tar.xz
linux-dev-6fd6b17c6d9713f56b5f20903ec3e00fa6cc435e.zip
Revert "[PATCH] mm: micro optimise zone_watermark_ok"
This reverts commit e80ee884ae0e3794ef2b65a18a767d502ad712ee. 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>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index fc5b5442e942..2c606cc922a5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -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)