linux-kernel - Re: [PATCH] x86: Add missing might_fault() from copy_{to,from}

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Date:	Mon, 16 Nov 2009 16:09:37 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH] x86: Add missing might_fault() from copy_{to,from}_user()


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> In x86-64, copy_to/from_user() rely on assembly routines that never
> call might_fault(), making us missing various lockdep checks.
> 
> This doesn't apply to __copy_from,to_user() that explicitly handle
> these calls, neither is it a problem in x86-32 where
> copy_to,from_user() rely on the "__" prefixed versions that also call
> might_fault().
> 
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> ---
>  arch/x86/include/asm/uaccess_64.h |   10 +++++++++-
>  arch/x86/lib/copy_user_64.S       |    4 ++--
>  2 files changed, 11 insertions(+), 3 deletions(-)

Looks good - other than that you missed the renaming of the symbol 
export line in arch/x86/kernel/x8664_ksyms_64.c, which i fixed.

Thanks,

	Ingo
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