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

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Message-ID: <20180111010122.t3m3kghctambsby5@two.firstfloor.org>
Date:   Wed, 10 Jan 2018 17:01:22 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Andi Kleen <andi@...stfloor.org>, Brian Gerst <brgerst@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Paul Turner <pjt@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Jiri Kosina <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

> So your series removes the old declarative annotation and then will add a new TI flag to make it work again?

The flag is a lot simpler than the previous assembler mess.

I thought the general trend in entry* was to move assembler to C?

> 
> This whole thing seems to be at the wrong end of the cost benefit curve.

But if you prefer assembler mess we can go back to it, no problem.

-Andi