linux-kernel - Re: [PATCH] writeback: initialize m

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20151118183344.GD11496@mtj.duckdns.org>
Date:	Wed, 18 Nov 2015 13:33:44 -0500
From:	Tejun Heo <tj@...nel.org>
To:	"Shi, Yang" <yang.shi@...aro.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH] writeback: initialize m_dirty to avoid compile warning

Hello,

On Wed, Nov 18, 2015 at 10:27:32AM -0800, Shi, Yang wrote:
> >This was the main reason the code was structured the way it is.  If
> >cgroup writeback is not enabled, any derefs of mdtc variables should
> >trigger warnings.  Ugh... I don't know.  Compiler really should be
> >able to tell this much.
> 
> Thanks for the explanation. It sounds like a compiler problem.
> 
> If you think it is still good to cease the compile warning, maybe we could

If this is gonna be a problem with new gcc versions, I don't think we
have any other options. :(

> just assign it to an insane value as what Andrew suggested, maybe
> 0xdeadbeef.

I'd just keep it at zero.  Whatever we do, the effect is gonna be
difficult to track down - it's not gonna blow up in an obvious way.
Can you please add a comment tho explaining that this is to work
around compiler deficiency?

Thanks.

-- 
tejun
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/