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authorJohannes Weiner <hannes@cmpxchg.org>2012-05-29 15:06:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-29 16:22:21 -0700
commit549381e19cc7874bb15f0e4760c1004d4fe28d8a (patch)
treefc2aef8ca6e57837e484b54e3f038a273a700ee8 /mm/bootmem.c
parent6dccdcbe2c3ebe152847ac8507e7bded4e3f4546 (diff)
downloadlinux-549381e19cc7874bb15f0e4760c1004d4fe28d8a.tar.gz
mm: bootmem: remove redundant offset check when finally freeing bootmem
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>
Diffstat (limited to 'mm/bootmem.c')
-rw-r--r--mm/bootmem.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/bootmem.c b/mm/bootmem.c
index 67872fca97d..053ac3f1cfe 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -204,7 +204,7 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
unsigned long off = 0;
vec >>= start & (BITS_PER_LONG - 1);
- while (vec && off < BITS_PER_LONG) {
+ while (vec) {
if (vec & 1) {
page = pfn_to_page(start + off);
__free_pages_bootmem(page, 0);