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thp: remove some code depend on CONFIG_NUMA 

If NUMA is disabled, hpage is used as page pre-alloc, so there are two
cases for hpage:

- it is !NULL, means the page is not consumed otherwise,
- the page has been consumed

If NUMA is enabled, hpage is just used as alloc-fail indicator which is
not a real page, NULL means not fail triggered.

So, we can release the page only if !IS_ERR_OR_NULL

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Xiao Guangrong 2012-10-08 16:29:46 -07:00 committed by Linus Torvalds
parent 2017c0bff8
commit 9817626e72
1 changed files with 3 additions and 7 deletions
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10
mm/huge_memory.c
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@ -2306,11 +2306,8 @@ static void khugepaged_wait_work(void)
static void khugepaged_loop(void)
{
struct page *hpage;
struct page *hpage = NULL;
#ifdef CONFIG_NUMA
hpage = NULL;
#endif
while (likely(khugepaged_enabled())) {
#ifndef CONFIG_NUMA
hpage = khugepaged_alloc_hugepage();
@ -2324,10 +2321,9 @@ static void khugepaged_loop(void)
#endif
khugepaged_do_scan(&hpage);
#ifndef CONFIG_NUMA
if (hpage)
if (!IS_ERR_OR_NULL(hpage))
put_page(hpage);
#endif
khugepaged_wait_work();
}