linux-kernel - Re: [PATCH v1 1/8] x86/entry/clearregs: Remove partial stack frame in fast system call

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Date:   Thu, 11 Jan 2018 21:22:37 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     tglx@...utronix.de, x86@...nel.org, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, dwmw@...zon.co.uk, pjt@...gle.com,
        luto@...nel.org, peterz@...radead.org, thomas.lendacky@....com,
        tim.c.chen@...ux.intel.com, gregkh@...ux-foundation.org,
        dave.hansen@...el.com, jikos@...nel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v1 1/8] x86/entry/clearregs: Remove partial stack frame
 in fast system call

On Tue, Jan 09, 2018 at 05:03:21PM -0800, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Remove the partial stack frame in the 64bit syscall fast path.
> In the next patch we want to clear the extra registers, which requires
> to always save all registers. So remove the partial stack frame
> in the syscall fast path and always save everything.
> 
> This actually simplifies the code because the ptregs stubs
> are not needed anymore.
> 
> arch/x86/entry/entry_64.S   | 57 ++++-----------------------------------------------------
> arch/x86/entry/syscall_64.c |  2 +-

This diffstat doesn't need to be in the changelog.

-- 
Josh