linux-kernel - Re: [PATCH v2 4/6] x86: Rewrite switch

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Message-ID: <CALCETrUEYnKens0MDXSd4P-feRaENvnUThtxjKxgdfmW6jbzFA@mail.gmail.com>
Date:	Sun, 19 Jun 2016 14:22:42 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Brian Gerst <brgerst@...il.com>
Cc:	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Borislav Petkov <bp@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2 4/6] x86: Rewrite switch_to() code

On Sat, Jun 18, 2016 at 1:56 PM, Brian Gerst <brgerst@...il.com> wrote:
> Move the low-level context switch code to an out-of-line asm stub instead of
> using complex inline asm.  This allows constructing a new stack frame for the
> child process to make it seamlessly flow to ret_from_fork without an extra
> test and branch in __switch_to().  It also improves code generation for
> __schedule() by using the C calling convention instead of clobbering all
> registers.

This is great.  The conflict with my stack code is minimal enough that
I won't bother rebasing unless someone specifically wants me to.

Acked-by: Andy Lutomirski <luto@...nel.org>

--Andy