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mm: bootmem: remove redundant offset check when finally freeing bootmem

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When bootmem releases an unaligned BITS_PER_LONG pages chunk of memory
to the page allocator, it checks the bitmap if there are still
unreserved pages in the chunk (set bits), but also if the offset in the
chunk indicates BITS_PER_LONG loop iterations already.

But since the consulted bitmap is only a one-word-excerpt of the full
per-node bitmap, there can not be more than BITS_PER_LONG bits set in
it.  The additional offset check is unnecessary.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2012-05-29 15:06:32 -07:00 committed by Linus Torvalds
parent 6dccdcbe2c
commit 549381e19c
1 changed files with 1 additions and 1 deletions
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mm/bootmem.c
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@ -204,7 +204,7 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
unsigned long off = 0; unsigned long off = 0;
vec >>= start & (BITS_PER_LONG - 1); vec >>= start & (BITS_PER_LONG - 1);
while (vec && off < BITS_PER_LONG) { while (vec) {
if (vec & 1) { if (vec & 1) {
page = pfn_to_page(start + off); page = pfn_to_page(start + off);
__free_pages_bootmem(page, 0); __free_pages_bootmem(page, 0);