linux-kernel - Re: [PATCH RFC 1/5] x86,fpu: split prev/next task fpu state handling

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Message-ID: <1475366578.21644.3.camel@redhat.com>
Date:   Sat, 01 Oct 2016 20:02:59 -0400
From:   Rik van Riel <riel@...hat.com>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     "H. Peter Anvin" <hpa@...or.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...e.de>,
        Paolo Bonzini <pbonzini@...hat.com>, X86 ML <x86@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH RFC 1/5] x86,fpu: split prev/next task fpu state
 handling

On Sat, 2016-10-01 at 16:26 -0700, Andy Lutomirski wrote:
> On Oct 1, 2016 1:49 PM, <riel@...hat.com> wrote:
> > 
> > 
> > From: Rik van Riel <riel@...hat.com>
> > 
> > Move all handling of the next state FPU state handling into
> > switch_fpu_finish, in preparation for more lazily switching
> > FPU states.
> > 
> > CR0.TS state is mirrored in a per-cpu variable, instead of
> > being passed around in a local variable, because that will
> > not be possible later in the series.
> 
> This seems reasonable in principle, but IMO it would be less scary if
> you rebased onto this:
> 
> https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/log/?h=x8
> 6/fpu

I can rebase on top of that.

I am perfectly fine with your patches going in
first, and mine later on. Too many FPU changes
at once is risky, anyway.

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