linux-kernel - Re: [PATCH 4.9 23/35] x86/mm: Expand static page table for fixmap space

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Date:   Fri, 2 Nov 2018 09:56:45 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Feng Tang <feng.tang@...el.com>
Cc:     Ben Hutchings <ben@...adent.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        kernel test robot <rong.a.chen@...el.com>,
        H Peter Anvin <hpa@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        Yinghai Lu <yinghai@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Andy Lutomirsky <luto@...nel.org>
Subject: Re: [PATCH 4.9 23/35] x86/mm: Expand static page table for fixmap
 space

On Fri, Nov 02, 2018 at 11:38:13AM +0800, Feng Tang wrote:
>Hi Ben,
>
>On Thu, Nov 01, 2018 at 10:25:43PM +0000, Ben Hutchings wrote:
>> On Thu, 2018-10-11 at 17:35 +0200, Greg Kroah-Hartman wrote:
>> > 4.9-stable review patch.  If anyone has any objections, please let me know.
>> >
>> > ------------------
>> >
>> > From: Feng Tang <feng.tang@...el.com>
>> >
>> > commit 05ab1d8a4b36ee912b7087c6da127439ed0a903e upstream.
>>
>> This backport is incorrect.  The part that updated __startup_64() in
>> arch/x86/kernel/head64.c was dropped, presumably because that function
>> doesn't exist in 4.9.  However that seems to be an essential of the
>> fix.  In 4.9 the startup_64 routine in arch/x86/kernel/head_64.S would
>> need to be changed instead.
>>
>> I also found that this introduces new boot-time warnings on some
>> systems if CONFIG_DEBUG_WX is enabled.
>>
>> So, unless someone provides fixes for those issues, I think this should
>> be reverted for the 4.9 branch.
>
>Thanks for the catch, I'm fine with the revert for now.

I've queued the revert, thank you.

--
Thanks,
Sasha