[PATCH] mm: micro optimise zone_watermark_ok
Having min be a signed quantity means gcc can't turn high latency divides into shifts. There happen to be two such divides for GFP_ATOMIC (ie. networking, ie. important) allocations, one of which depends on the other. Fixing this makes code smaller as a bonus. Shame on somebody (probably me). Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -900,7 +900,8 @@ int zone_watermark_ok(struct zone *z, int order, unsigned long mark,
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int classzone_idx, int alloc_flags)
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{
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/* free_pages my go negative - that's OK */
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long min = mark, free_pages = z->free_pages - (1 << order) + 1;
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unsigned long min = mark;
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long free_pages = z->free_pages - (1 << order) + 1;
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int o;
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if (alloc_flags & ALLOC_HIGH)
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