Messages in this thread | | | Date | Wed, 14 Aug 2013 23:27:46 -0400 | From | Tejun Heo <> | Subject | Re: [PATCH 1/1] memblock cleanup: Remove unnecessary check in memblock_find_in_range_node() |
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Hello, Tang.
On Thu, Aug 15, 2013 at 11:23:19AM +0800, Tang Chen wrote: > Furthermore, we don't need to check "if (this_end < size)" actually. Without > this confusing check, we only waste some loops. So this patch removes the > check. > > Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com> > --- > mm/memblock.c | 3 --- > 1 files changed, 0 insertions(+), 3 deletions(-) > > diff --git a/mm/memblock.c b/mm/memblock.c > index a847bfe..e0c626e 100644 > --- a/mm/memblock.c > +++ b/mm/memblock.c > @@ -114,9 +114,6 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start, > this_start = clamp(this_start, start, end); > this_end = clamp(this_end, start, end); > > - if (this_end < size) > - continue; > - > cand = round_down(this_end - size, align); > if (cand >= this_start) > return cand;
Hmmm... maybe I'm missing something but are you sure? "this_end - size" can underflow and "cand >= this_start" will be true incorrectly.
Thanks.
-- tejun
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