From: Johannes Weiner <hannes@cmpxchg.org>
To: Alex Shi <alex.shi@linux.alibaba.com>
Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, akpm@linux-foundation.org,
mgorman@techsingularity.net, tj@kernel.org, hughd@google.com,
khlebnikov@yandex-team.ru, daniel.m.jordan@oracle.com,
yang.shi@linux.alibaba.com, willy@infradead.org,
shakeelb@google.com
Subject: Re: [PATCH v4 1/9] mm/swap: fix uninitialized compiler warning
Date: Tue, 19 Nov 2019 10:41:38 -0500 [thread overview]
Message-ID: <20191119154138.GB382712@cmpxchg.org> (raw)
In-Reply-To: <1574166203-151975-2-git-send-email-alex.shi@linux.alibaba.com>
On Tue, Nov 19, 2019 at 08:23:15PM +0800, Alex Shi wrote:
> ../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);
> ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
At this point in the series, there is no lock_page_lruvec_irqsave()
yet, so this patch is out of order. Please don't do that. It's very
hard to review patches that depend on later changes to make sense.
> Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: linux-mm@kvack.org
> Cc: linux-kernel@vger.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;
Use unintialized_var() for these cases to make the intent clear.
next prev parent reply other threads:[~2019-11-19 15:41 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-19 12:23 [PATCH v4 0/9] per lruvec lru_lock for memcg Alex Shi
2019-11-19 12:23 ` [PATCH v4 1/9] mm/swap: fix uninitialized compiler warning Alex Shi
2019-11-19 15:41 ` Johannes Weiner [this message]
2019-11-20 11:42 ` Alex Shi
2019-11-19 12:23 ` [PATCH v4 2/9] mm/huge_memory: " Alex Shi
2019-11-19 15:42 ` Johannes Weiner
2019-11-19 12:23 ` [PATCH v4 3/9] mm/lru: replace pgdat lru_lock with lruvec lock Alex Shi
2019-11-19 15:57 ` Matthew Wilcox
2019-11-19 16:44 ` Johannes Weiner
2019-11-20 11:50 ` Alex Shi
2019-11-19 16:04 ` Johannes Weiner
2019-11-20 11:41 ` Alex Shi
2019-11-21 22:06 ` Johannes Weiner
2019-11-22 2:36 ` Alex Shi
2019-11-22 16:16 ` Johannes Weiner
2019-11-23 0:58 ` Hugh Dickins
2019-11-24 15:19 ` Alex Shi
2019-11-25 9:26 ` Alex Shi
2019-11-25 17:27 ` Shakeel Butt
2019-11-19 16:49 ` Shakeel Butt
2019-11-19 12:23 ` [PATCH v4 4/9] mm/mlock: only change the lru_lock iff page's lruvec is different Alex Shi
2019-11-19 12:23 ` [PATCH v4 5/9] mm/swap: " Alex Shi
2019-11-19 12:23 ` [PATCH v4 6/9] mm/vmscan: " Alex Shi
2019-11-19 12:23 ` [PATCH v4 7/9] mm/pgdat: remove pgdat lru_lock Alex Shi
2019-11-19 12:23 ` [PATCH v4 8/9] mm/lru: likely enhancement Alex Shi
2019-11-19 12:23 ` [PATCH v4 9/9] mm/lru: revise the comments of lru_lock Alex Shi
2019-11-19 16:19 ` Johannes Weiner
2019-11-20 11:48 ` Alex Shi
2019-11-24 15:49 ` [PATCH v4 0/9] per lruvec lru_lock for memcg Konstantin Khlebnikov
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