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mm, hugetlb: grab a page_table_lock after page_cache_release 

We don't need to grab a page_table_lock when we try to release a page.
So, defer to grab a page_table_lock.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: Davidlohr Bueso <davidlohr@hp.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Cc: Hillf Danton <dhillf@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joonsoo Kim 2013-09-11 14:21:57 -07:00 committed by Linus Torvalds
parent 5944d0116c
commit 8312034f36
1 changed files with 3 additions and 2 deletions
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5
mm/hugetlb.c
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@ -2647,10 +2647,11 @@ retry_avoidcopy:
}
spin_unlock(&mm->page_table_lock);
mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
/* Caller expects lock to be held */
spin_lock(&mm->page_table_lock);
page_cache_release(new_page);
page_cache_release(old_page);
/* Caller expects lock to be held */
spin_lock(&mm->page_table_lock);
return 0;
}