Re: [PATCH 1/2] x86: unify copy_from_user() size checking

From: Ingo Molnar
Date: Mon Oct 28 2013 - 06:55:27 EST



* Jan Beulich <JBeulich@xxxxxxxx> wrote:

> >>> On 26.10.13 at 12:31, Ingo Molnar <mingo@xxxxxxxxxx> wrote:
> > * Jan Beulich <JBeulich@xxxxxxxx> 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.

Mind submitting a patch? I can keep it pending until v3.14, that
should give time for compiler dependencies to be caught. Even if it
breaks anything it shouldn't be too hard to revert again ;-)

Thanks,

Ingo
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