linux-kernel - [PATCH 1/2] numa, mm: drop redundant check in do_huge_pmd_numa

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Date:	Fri, 26 Oct 2012 15:54:34 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	linux-mm@...ck.org
Cc:	Will Deacon <will.deacon@....com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] numa, mm: drop redundant check in do_huge_pmd_numa_page()

From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>

We check if the pmd entry is the same as on pmd_trans_huge() in
handle_mm_fault(). That's enough.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 mm/huge_memory.c |    6 ------
 1 file changed, 6 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 3c14a96..9bb2c23 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -758,12 +758,6 @@ void do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
 	if (unlikely(!pmd_same(*pmd, entry)))
 		goto unlock;
 
-	if (unlikely(pmd_trans_splitting(entry))) {
-		spin_unlock(&mm->page_table_lock);
-		wait_split_huge_page(vma->anon_vma, pmd);
-		return;
-	}
-
 	page = pmd_page(entry);
 	if (page) {
 		VM_BUG_ON(!PageCompound(page) || !PageHead(page));
-- 
1.7.10.4

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