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authorJohannes Weiner <hannes@cmpxchg.org>2012-01-10 15:08:13 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-10 16:30:44 -0800
commit560a036b3a3733e33424385c0a0c799dee454d05 (patch)
tree07d1ddc729e233d0590b308f1ea7d04405e796b6
parentc3993076f842de3754360e5b998d6657a9d30303 (diff)
downloadlinux-560a036b3a3733e33424385c0a0c799dee454d05.tar.bz2
mm: bootmem: drop superfluous range check when freeing pages in bulk
The area node_bootmem_map represents is aligned to BITS_PER_LONG, and all bits in any aligned word of that map valid. When the represented area extends beyond the end of the node, the non-existant pages will be marked as reserved. As a result, when freeing a page block, doing an explicit range check for whether that block is within the node's range is redundant as the bitmap is consulted anyway to see whether all pages in the block are unreserved. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/bootmem.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/bootmem.c b/mm/bootmem.c
index 3e6f152f117e..1aea171539ac 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -197,7 +197,7 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
idx = start - bdata->node_min_pfn;
vec = ~map[idx / BITS_PER_LONG];
- if (aligned && vec == ~0UL && start + BITS_PER_LONG <= end) {
+ if (aligned && vec == ~0UL) {
int order = ilog2(BITS_PER_LONG);
__free_pages_bootmem(pfn_to_page(start), order);