linux-kernel - Re: [PATCH] Consolidate CONFIG_DEBUG_STRICT_USER_COPY

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Message-ID: <512E8E48.8020007@codeaurora.org>
Date:	Wed, 27 Feb 2013 14:52:56 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	linux-parisc@...r.kernel.org, linux-s390@...r.kernel.org,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Helge Deller <deller@....de>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Chris Metcalf <cmetcalf@...era.com>
Subject: Re: [PATCH] Consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECK

On 02/27/13 14:19, H. Peter Anvin wrote:
> On 02/27/2013 12:42 PM, Stephen Boyd wrote:
>>> It's fine to do your patch as a first step though, which would not
>>> change the behavior.
>> A lot of arches seem to not want to enable it because false positives
>> are everywhere. It really depends on how good the compiler is at doing
>> constant propagation and dead code removal.
>>
> Although some of the cases I have seen being flagged as "false
> positives" have been real bugs.

There were so many false-positives on x86_64 that Andrew eventually
dropped my patch to add support for this option to the copy_from_user()
function there.

-- 
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