Commit 8312034f authored Sep 11, 2013 by Joonsoo Kim Committed by Linus Torvalds Sep 11, 2013

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>

parent 5944d011

mm/hugetlb.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -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;
		}