linux-kernel - [PATCHv9-rebased2 02/37] mm-thp-make-swapin-readahead-under-down_read-of-mmap

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Date:	Wed, 15 Jun 2016 23:06:07 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Hugh Dickins <hughd@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Dave Hansen <dave.hansen@...el.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Christoph Lameter <cl@...two.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Jerome Marchand <jmarchan@...hat.com>,
	Yang Shi <yang.shi@...aro.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Andres Lagar-Cavilla <andreslc@...gle.com>,
	Ning Qu <quning@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	Ebru Akagunduz <ebru.akagunduz@...il.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Michal Hocko <mhocko@...e.cz>
Subject: [PATCHv9-rebased2 02/37]  mm-thp-make-swapin-readahead-under-down_read-of-mmap_sem-fix

Passing 'vma' to hugepage_vma_revlidate() is useless.  It doesn't make use
of it anyway.

Link: http://lkml.kernel.org/r/20160530095058.GA53044@black.fi.intel.com

Cc: Ebru Akagunduz <ebru.akagunduz@...il.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Michal Hocko <mhocko@...e.cz>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
 mm/huge_memory.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 96dfe3f09bf6..7bb30e853335 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2384,10 +2384,9 @@ static bool hugepage_vma_check(struct vm_area_struct *vma)
  * value (scan code).
  */
 
-static int hugepage_vma_revalidate(struct mm_struct *mm,
-				   struct vm_area_struct *vma,
-				   unsigned long address)
+static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address)
 {
+	struct vm_area_struct *vma;
 	unsigned long hstart, hend;
 
 	if (unlikely(khugepaged_test_exit(mm)))
@@ -2436,7 +2435,7 @@ static bool __collapse_huge_page_swapin(struct mm_struct *mm,
 		if (ret & VM_FAULT_RETRY) {
 			down_read(&mm->mmap_sem);
 			/* vma is no longer available, don't continue to swapin */
-			if (hugepage_vma_revalidate(mm, vma, address))
+			if (hugepage_vma_revalidate(mm, address))
 				return false;
 		}
 		if (ret & VM_FAULT_ERROR) {
@@ -2487,7 +2486,7 @@ static void collapse_huge_page(struct mm_struct *mm,
 	}
 
 	down_read(&mm->mmap_sem);
-	result = hugepage_vma_revalidate(mm, vma, address);
+	result = hugepage_vma_revalidate(mm, address);
 	if (result)
 		goto out;
 
@@ -2514,7 +2513,7 @@ static void collapse_huge_page(struct mm_struct *mm,
 	 * handled by the anon_vma lock + PG_lock.
 	 */
 	down_write(&mm->mmap_sem);
-	result = hugepage_vma_revalidate(mm, vma, address);
+	result = hugepage_vma_revalidate(mm, address);
 	if (result)
 		goto out;
 
-- 
2.8.1