linux-kernel - [PATCH 2/2] numa, mm: consolidate error path in do_huge_pmd_numa

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Date:	Fri, 26 Oct 2012 15:54:35 +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 2/2] numa, mm: consolidate error path in do_huge_pmd_numa_page()

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

Let's move all error path code to the end if the function. It makes code
more straight-forward.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 mm/huge_memory.c |   44 ++++++++++++++++++++------------------------
 1 file changed, 20 insertions(+), 24 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 9bb2c23..95ec485 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -759,30 +759,14 @@ void do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
 		goto unlock;
 
 	page = pmd_page(entry);
-	if (page) {
-		VM_BUG_ON(!PageCompound(page) || !PageHead(page));
-
-		get_page(page);
-		node = mpol_misplaced(page, vma, haddr);
-		if (node != -1)
-			goto migrate;
-	}
-
-fixup:
-	/* change back to regular protection */
-	entry = pmd_modify(entry, vma->vm_page_prot);
-	set_pmd_at(mm, haddr, pmd, entry);
-	update_mmu_cache_pmd(vma, address, entry);
-
-unlock:
-	spin_unlock(&mm->page_table_lock);
-	if (page) {
-		task_numa_fault(page_to_nid(page), HPAGE_PMD_NR);
-		put_page(page);
-	}
-	return;
+	if (!page)
+		goto fixup;
+	VM_BUG_ON(!PageCompound(page) || !PageHead(page));
 
-migrate:
+	get_page(page);
+	node = mpol_misplaced(page, vma, haddr);
+	if (node == -1)
+		goto fixup;
 	spin_unlock(&mm->page_table_lock);
 
 	lock_page(page);
@@ -871,7 +855,19 @@ alloc_fail:
 		page = NULL;
 		goto unlock;
 	}
-	goto fixup;
+fixup:
+	/* change back to regular protection */
+	entry = pmd_modify(entry, vma->vm_page_prot);
+	set_pmd_at(mm, haddr, pmd, entry);
+	update_mmu_cache_pmd(vma, address, entry);
+
+unlock:
+	spin_unlock(&mm->page_table_lock);
+	if (page) {
+		task_numa_fault(page_to_nid(page), HPAGE_PMD_NR);
+		put_page(page);
+	}
+	return;
 }
 
 int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
-- 
1.7.10.4

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