linux-kernel - [PATCH v4 1/9] mm/swap: fix uninitialized compiler warning

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Date:   Tue, 19 Nov 2019 20:23:15 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, akpm@...ux-foundation.org,
        mgorman@...hsingularity.net, tj@...nel.org, hughd@...gle.com,
        khlebnikov@...dex-team.ru, daniel.m.jordan@...cle.com,
        yang.shi@...ux.alibaba.com, willy@...radead.org,
        shakeelb@...gle.com, hannes@...xchg.org
Cc:     Alex Shi <alex.shi@...ux.alibaba.com>
Subject: [PATCH v4 1/9] mm/swap: fix uninitialized compiler warning

  ../mm/swap.c: In function ‘__page_cache_release’:
  ../mm/swap.c:67:10: warning: ‘flags’ may be used uninitialized in this
  function [-Wmaybe-uninitialized]
       lruvec = lock_page_lruvec_irqsave(page, pgdat, flags);
       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
---
 mm/swap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/swap.c b/mm/swap.c
index 5341ae93861f..c36a10244d07 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -62,7 +62,7 @@ static void __page_cache_release(struct page *page)
 	if (PageLRU(page)) {
 		pg_data_t *pgdat = page_pgdat(page);
 		struct lruvec *lruvec;
-		unsigned long flags;
+		unsigned long flags = 0;
 
 		spin_lock_irqsave(&pgdat->lru_lock, flags);
 		lruvec = mem_cgroup_page_lruvec(page, pgdat);
-- 
1.8.3.1