linux-kernel - Re: [PATCH 9/9] Consolidate CONFIG_DEBUG_STRICT_USER_COPY

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Message-ID: <4DCC817D.3090005@tilera.com>
Date:	Thu, 12 May 2011 20:55:25 -0400
From:	Chris Metcalf <cmetcalf@...era.com>
To:	Stephen Boyd <sboyd@...eaurora.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
	<x86@...nel.org>, <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>
Subject: Re: [PATCH 9/9] Consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS

On 5/12/2011 7:50 PM, Stephen Boyd wrote:
> The help text for this config is duplicated across the x86,
> parisc, and s390 Kconfig.debug files. Arnd Bergman noted that the
> help text was slightly misleading and should be fixed to state
> that enabling this option isn't a problem when using pre 4.4 gcc.
>
> To simplify the rewording, consolidate the text into
> lib/Kconfig.debug and modify it there to be more explicit about
> when you should say N to this config.
>
> Also, make the text a bit more generic by stating that this
> option enables compile time checks so we can cover architectures
> which emit warnings vs. ones which emit errors. The details of
> how an architecture decided to implement the checks isn't as
> important as the concept of compile time checking of
> copy_from_user() calls.
>
> While we're doing this, remove all the copy_from_user_overflow()
> code that's duplicated many times and place it into lib/ so that
> any architecture supporting this option can get the function for
> free.
>
> ---
>  arch/tile/Kconfig               |    8 +-------
>  arch/tile/include/asm/uaccess.h |    7 ++++++-
>  arch/tile/lib/uaccess.c         |    8 --------

Acked-by: Chris Metcalf <cmetcalf@...era.com>

-- 
Chris Metcalf, Tilera Corp.
http://www.tilera.com


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