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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 /mm/bootmem.c
parentc3993076f842de3754360e5b998d6657a9d30303 (diff)
downloadlinux-560a036b3a3733e33424385c0a0c799dee454d05.tar.gz
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-K├Ânig <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>
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 3e6f152f117..1aea171539a 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);