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thp: compound_trans_order

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Read compound_trans_order safe. Noop for CONFIG_TRANSPARENT_HUGEPAGE=n.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrea Arcangeli
2011-01-13 15:47:16 -08:00
committed by Linus Torvalds
parent 91600e9e59
commit 37c2ac7872
3 changed files with 26 additions and 12 deletions
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12
mm/memcontrol.c
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@ -1027,10 +1027,6 @@ mem_cgroup_get_reclaim_stat_from_page(struct page *page)
{
struct page_cgroup *pc;
struct mem_cgroup_per_zone *mz;
int page_size = PAGE_SIZE;
if (PageTransHuge(page))
page_size <<= compound_order(page);
if (mem_cgroup_disabled())
return NULL;
@ -2286,8 +2282,10 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
int ret;
int page_size = PAGE_SIZE;
if (PageTransHuge(page))
if (PageTransHuge(page)) {
page_size <<= compound_order(page);
VM_BUG_ON(!PageTransHuge(page));
}
pc = lookup_page_cgroup(page);
/* can happen at boot */
@ -2558,8 +2556,10 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
if (PageSwapCache(page))
return NULL;
if (PageTransHuge(page))
if (PageTransHuge(page)) {
page_size <<= compound_order(page);
VM_BUG_ON(!PageTransHuge(page));
}
count = page_size >> PAGE_SHIFT;
/*