linux-kernel - Re: [PATCH v3 0/7] x86: Rewrite switch

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Message-ID: <20160817212016.dqjcb7nqboalgjck@treble>
Date:	Wed, 17 Aug 2016 16:20:16 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Brian Gerst <brgerst@...il.com>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Borislav Petkov <bp@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v3 0/7] x86: Rewrite switch_to()

On Sat, Aug 13, 2016 at 12:38:15PM -0400, Brian Gerst wrote:
> This patch set simplifies the switch_to() code, by moving the stack switch
> code out of line into an asm stub before calling __switch_to().  This ends
> up being more readable, and using the C calling convention instead of
> clobbering all registers improves code generation.  It also allows newly
> forked processes to construct a special stack frame to seamlessly flow
> to ret_from_fork, instead of using a test and branch, or an unbalanced
> call/ret.
> 
> Changes from v2:
> - Updated comments around kernel threads being uncommon for fork, etc.
> - Removed STACK_FRAME_NON_STANDARD annotation from __schedule() per Josh Poimboeuf
> - A few minor cleanups added

There are a few minor conflicts with my x86 stack dump patch set, but
for the most part they should be orthogonal.

For the series:

  Reviewed-by: Josh Poimboeuf <jpoimboe@...hat.com>

-- 
Josh