linux-kernel - Re: [PATCH] mm: initialize variable for mem_cgroup_end_page

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Message-ID: <5452612C.5090609@oracle.com>
Date:	Thu, 30 Oct 2014 12:02:52 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	Michal Hocko <mhocko@...e.cz>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, riel@...hat.com,
	peterz@...radead.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: initialize variable for mem_cgroup_end_page_stat

On 10/30/2014 11:06 AM, Johannes Weiner wrote:
>> You're using that value as soon as you are passing it to a function, it
>> > doesn't matter what happens inside that function.
> It's copied as part of the pass-by-value protocol, but we really don't
> do anything with it.  So why does it matter?

Because it's undefined behaviour, which gives your compiler a license to
do whatever it wants?


Thanks,
Sasha

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