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

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Message-ID: <20180123072533.GA17566@kroah.com>
Date:   Tue, 23 Jan 2018 08:25:33 +0100
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     "Zhang, Ning A" <ning.a.zhang@...el.com>,
        "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 07:06:29PM -0800, Andy Lutomirski wrote:
> 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?

I'll work on this after this round of stable kernels are released.

thanks,

greg k-h