linux-kernel - Re: [patch V3 02/20] x86/process: Unify copy_thread

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Date:   Wed, 13 Nov 2019 14:10:06 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Willy Tarreau <w@....eu>, Juergen Gross <jgross@...e.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [patch V3 02/20] x86/process: Unify copy_thread_tls()

On Wed, Nov 13, 2019 at 1:41 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> See commit: 64604d54d311 ("sched/x86_64: Don't save flags on context switch")
>
> We need "only" make objtool support 32bit :)

Duh, I knew that.

Maybe just a comment in the structure and/or the __switch_to_asm() so
that next time I forget I won't look like such a tool.

The "Save callee-saved registers" comment we have now in the 32-bit
__switch_to_asm() really is misleading and incorrect wrt the pushfl.

            Linus