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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2012-01-10 15:08:00 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-10 16:30:44 -0800
commit9571a982903bf9dcbca2479fd3e7dafd2211ecf9 (patch)
tree6a426c81c23cc4e5e81388c52ff37ed33a1187ac /mm/bootmem.c
parent31b8384a555d94c78e2ea2284a323cb985441f60 (diff)
downloadlinux-9571a982903bf9dcbca2479fd3e7dafd2211ecf9.tar.gz
bootmem: micro optimize freeing pages in bulk
The first entry of bdata->node_bootmem_map holds the data for bdata->node_min_pfn up to bdata->node_min_pfn + BITS_PER_LONG - 1. So the test for freeing all pages of a single map entry can be slightly relaxed. Moreover use DIV_ROUND_UP in another place instead of open coding it. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Johannes Weiner <hannes@saeurebad.de> 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.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/bootmem.c b/mm/bootmem.c
index 1a77012ecdb..3e6f152f117 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -56,7 +56,7 @@ early_param("bootmem_debug", bootmem_debug_setup);
static unsigned long __init bootmap_bytes(unsigned long pages)
{
- unsigned long bytes = (pages + 7) / 8;
+ unsigned long bytes = DIV_ROUND_UP(pages, 8);
return ALIGN(bytes, sizeof(long));
}
@@ -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 && start + BITS_PER_LONG <= end) {
int order = ilog2(BITS_PER_LONG);
__free_pages_bootmem(pfn_to_page(start), order);