linux-kernel - Re: backport Rewrite sync_core() to use IRET-to-self to stable kernels?

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Message-ID: <CALCETrWDe3egrW_BY0W0J9fLuUDTrJE0Az4brd3_H6Szbyn2pA@mail.gmail.com>
Date:   Mon, 22 Jan 2018 19:06:29 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     "Zhang, Ning A" <ning.a.zhang@...el.com>
Cc:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "luto@...nel.org" <luto@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: backport Rewrite sync_core() to use IRET-to-self to stable kernels?

On Mon, Jan 22, 2018 at 6:59 PM, Zhang, Ning A <ning.a.zhang@...el.com> wrote:
> hello, Greg, Andy, Thomas
>
> would you like to backport these two patches to LTS kernel?
>
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/arch/x86/include/asm/processor.h?h=v4.14.14&id=1c52d859cb2d417e7216d3e56bb7fea88444cec9
>
> x86/asm/32: Make sync_core() handle missing CPUID on all 32-bit kernels
>
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/arch/x86/include/asm/processor.h?h=v4.14.14&id=c198b121b1a1d7a7171770c634cd49191bac4477
>
> x86/asm: Rewrite sync_core() to use IRET-to-self
>

I'd be in favor of backporting
1c52d859cb2d417e7216d3e56bb7fea88444cec9.  I see no compelling reason
to backport the other one, since it doesn't fix a bug.  Greg, can you
do this?