linux-kernel - [PATCH v3 1/2] mm, thp: fix comment inconsistency for swapin readahead functions

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Date:	Sun, 10 Jul 2016 03:09:05 +0300
From:	Ebru Akagunduz <ebru.akagunduz@...il.com>
To:	linux-mm@...ck.org
Cc:	hughd@...gle.com, riel@...hat.com, akpm@...ux-foundation.org,
	kirill.shutemov@...ux.intel.com, n-horiguchi@...jp.nec.com,
	aarcange@...hat.com, iamjoonsoo.kim@....com, gorcunov@...nvz.org,
	linux-kernel@...r.kernel.org, mgorman@...e.de, rientjes@...gle.com,
	vbabka@...e.cz, aneesh.kumar@...ux.vnet.ibm.com,
	hannes@...xchg.org, mhocko@...e.cz, boaz@...xistor.com,
	hillf.zj@...baba-inc.com, Ebru Akagunduz <ebru.akagunduz@...il.com>
Subject: [PATCH v3 1/2] mm, thp: fix comment inconsistency for swapin readahead functions

After fixing swapin issues, comment lines stayed as in old version.
This patch updates the comments.

Signed-off-by: Ebru Akagunduz <ebru.akagunduz@...il.com>
Cc: Hillf Danton <hillf.zj@...baba-inc.com>
---
Changes in v2:
 - Newly created in this version.

Changes in v3:
 - Replace Reported-by with Cc (Hillf Danton)
 - Remove RFC tag (Hillf Danton)
 - After khugepaged extracted from huge_memory.c,
   changes moved to khugepaged.c

 mm/khugepaged.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 93d5f87..5661484 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -891,9 +891,10 @@ static bool __collapse_huge_page_swapin(struct mm_struct *mm,
 		/* do_swap_page returns VM_FAULT_RETRY with released mmap_sem */
 		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, address))
+			if (hugepage_vma_revalidate(mm, address)) {
+				/* vma is no longer available, don't continue to swapin */
 				return false;
+			}
 			/* check if the pmd is still valid */
 			if (mm_find_pmd(mm, address) != pmd)
 				return false;
@@ -969,7 +970,7 @@ static void collapse_huge_page(struct mm_struct *mm,
 
 	/*
 	 * __collapse_huge_page_swapin always returns with mmap_sem locked.
-	 * If it fails, release mmap_sem and jump directly out.
+	 * If it fails, we release mmap_sem and jump out_nolock.
 	 * Continuing to collapse causes inconsistency.
 	 */
 	if (!__collapse_huge_page_swapin(mm, vma, address, pmd)) {
-- 
1.9.1