linux-kernel - Re: [PATCH 1/2] x86: unify copy_from

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Message-Id: <526E1EFA02000078000FD1E7@nat28.tlf.novell.com>
Date:	Mon, 28 Oct 2013 07:23:22 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Ingo Molnar" <mingo@...nel.org>
Cc:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>, <mingo@...e.hu>,
	<tglx@...utronix.de>, "Andrew Morton" <akpm@...ux-foundation.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	<arjan@...ux.intel.com>, <linux@...ck-us.net>,
	<linux-kernel@...r.kernel.org>, <hpa@...or.com>
Subject: Re: [PATCH 1/2] x86: unify copy_from_user() size checking

>>> On 26.10.13 at 12:31, Ingo Molnar <mingo@...nel.org> wrote:
> * Jan Beulich <JBeulich@...e.com> wrote:
>> I'd like to point out though that with __compiletime_object_size()
>> being restricted to gcc before 4.6, the whole construct is going to
>> become more and more pointless going forward. I would question
>> however that commit 2fb0815c9ee6b9ac50e15dd8360ec76d9fa46a2 ("gcc4:
>> disable __compiletime_object_size for GCC 4.6+") was really necessary,
>> and instead this should have been dealt with as is done here from the
>> beginning.
> 
> Can we now revert 2fb0815c9ee6?

Afaict yes, but I certainly didn't test with all possible gcc versions.
So minimally everyone involved in getting that change in would be
good to be in agreement.

Jan

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