linux-kernel - [PATCH] mm/rmap.c: remove set but not used variable 'cstart'

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Message-ID: <20190724141453.38536-1-yuehaibing@huawei.com>
Date:   Wed, 24 Jul 2019 22:14:53 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <akpm@...ux-foundation.org>, <jglisse@...hat.com>,
        <kirill.shutemov@...ux.intel.com>, <mike.kravetz@...cle.com>,
        <rcampbell@...dia.com>, <ktkhai@...tuozzo.com>,
        <colin.king@...onical.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH] mm/rmap.c: remove set but not used variable 'cstart'

Fixes gcc '-Wunused-but-set-variable' warning:

mm/rmap.c: In function page_mkclean_one:
mm/rmap.c:906:17: warning: variable cstart set but not used [-Wunused-but-set-variable]

It is not used any more since
commit cdb07bdea28e ("mm/rmap.c: remove redundant variable cend")

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 mm/rmap.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/mm/rmap.c b/mm/rmap.c
index ec1af8b..40e4def 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -903,10 +903,9 @@ static bool page_mkclean_one(struct page *page, struct vm_area_struct *vma,
 	mmu_notifier_invalidate_range_start(&range);
 
 	while (page_vma_mapped_walk(&pvmw)) {
-		unsigned long cstart;
 		int ret = 0;
 
-		cstart = address = pvmw.address;
+		address = pvmw.address;
 		if (pvmw.pte) {
 			pte_t entry;
 			pte_t *pte = pvmw.pte;
@@ -933,7 +932,6 @@ static bool page_mkclean_one(struct page *page, struct vm_area_struct *vma,
 			entry = pmd_wrprotect(entry);
 			entry = pmd_mkclean(entry);
 			set_pmd_at(vma->vm_mm, address, pmd, entry);
-			cstart &= PMD_MASK;
 			ret = 1;
 #else
 			/* unexpected pmd-mapped page? */
-- 
2.7.4