From: David Rientjes <rientjes@google.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>,
Mel Gorman <mgorman@techsingularity.net>,
Michal Hocko <mhocko@suse.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: ensure alloc_flags in slow path are initialized
Date: Mon, 23 Jan 2017 14:54:28 -0800 (PST) [thread overview]
Message-ID: <alpine.DEB.2.10.1701231454170.126378@chino.kir.corp.google.com> (raw)
In-Reply-To: <20170123121649.3180300-1-arnd@arndb.de>
On Mon, 23 Jan 2017, Arnd Bergmann wrote:
> The __alloc_pages_slowpath() has gotten rather complex and gcc
> is no longer able to follow the gotos and prove that the
> alloc_flags variable is initialized at the time it is used:
>
> mm/page_alloc.c: In function '__alloc_pages_slowpath':
> mm/page_alloc.c:3565:15: error: 'alloc_flags' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>
> To be honest, I can't figure that out either, maybe it is or
> maybe not, but moving the existing initialization up a little
> higher looks safe and makes it obvious to both me and gcc that
> the initialization comes before the first use.
>
> Fixes: 74eaa4a97e8e ("mm: consolidate GFP_NOFAIL checks in the allocator slowpath")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: David Rientjes <rientjes@google.com>
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next prev parent reply other threads:[~2017-01-23 22:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-23 12:16 Arnd Bergmann
2017-01-23 12:55 ` Vlastimil Babka
2017-01-23 16:02 ` Arnd Bergmann
2017-01-23 22:54 ` David Rientjes [this message]
2017-01-23 23:56 ` Andrew Morton
2017-01-24 9:19 ` Vlastimil Babka
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