linux-kernel - Re: [tip:x86/asm] x86/asm: Optimize clear

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Message-ID: <CAE9FiQX2xKUKbjf4N6pasSAeMm3qX4h6+DAoNwsdYe_qtZ08dA@mail.gmail.com>
Date:   Tue, 7 Mar 2017 10:57:51 -0800
From:   Yinghai Lu <yinghai@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     "H. Peter Anvin" <hpa@...or.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Wu Fengguang <fengguang.wu@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Borislav Petkov <bp@...e.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Brian Gerst <brgerst@...il.com>,
        "linux-tip-commits@...r.kernel.org" 
        <linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:x86/asm] x86/asm: Optimize clear_page()

On Mon, Mar 6, 2017 at 11:30 PM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Yinghai Lu <yinghai@...nel.org> wrote:
>
>> On Wed, Mar 1, 2017 at 1:47 AM, tip-bot for Borislav Petkov
>> <tipbot@...or.com> wrote:
>> > Commit-ID:  49ca7bb328c630dd43be626534b49e19513296fd
>> > Gitweb:     http://git.kernel.org/tip/49ca7bb328c630dd43be626534b49e19513296fd
>> > Author:     Borislav Petkov <bp@...e.de>
>> > AuthorDate: Thu, 9 Feb 2017 01:34:49 +0100
>> > Committer:  Ingo Molnar <mingo@...nel.org>
>> > CommitDate: Wed, 1 Mar 2017 10:18:32 +0100
>> >
>> > x86/asm: Optimize clear_page()
>> >
>> > Currently, we CALL clear_page() which then JMPs to the proper function
>> > chosen by the alternatives.
>> >
>> > What we should do instead is CALL the proper function directly. (This
>> > was something Ingo suggested a while ago). So let's do that.
>>
>> looks like this one broke the kexec.
>> after revert it back, kexec work again.
>
> Ok, this should be fixed in the new version I just pushed out:
>
>   f25d38475519 x86/asm: Optimize clear_page()
>
> Please let me know if it doesn't.

Yes. new commit works with kexec.

Thanks

Yinghai