linux-kernel - Re: linux-next: manual merge of the xen-tip tree with the tip tree

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Message-ID: <87efxgpfcc.fsf@vitty.brq.redhat.com>
Date:   Wed, 29 Mar 2017 12:06:11 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Juergen Gross <jgross@...e.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Xen Devel <Xen-devel@...ts.xensource.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>,
        Mathias Krause <minipli@...glemail.com>,
        Thomas Garnier <thgarnie@...gle.com>
Subject: Re: linux-next: manual merge of the xen-tip tree with the tip tree

Juergen Gross <jgross@...e.com> writes:

> On 29/03/17 10:59, Ingo Molnar wrote:
>> 
>> * Juergen Gross <jgross@...e.com> wrote:
>> 
>>> On 29/03/17 05:35, Stephen Rothwell wrote:
>>>> Hi all,
>>>>
>>>> Today's linux-next merge of the xen-tip tree got a conflict in:
>>>>
>>>>   arch/x86/xen/enlighten.c
>>>>
>>>> between commits:
>>>>
>>>>   6415813bae75 ("x86/cpu: Drop wp_works_ok member of struct cpuinfo_x86")
>>>>   69218e47994d ("x86: Remap GDT tables in the fixmap section")
>>>>   b23adb7d3f7d ("x86/xen/gdt: Use X86_FEATURE_XENPV instead of globals for the GDT fixup")
>>>>
>>>> from the tip tree and commits:
>>>>
>>>>   75cd32d6093e ("x86/xen: split off enlighten_pv.c")
>>>>
>>>> from the xen-tip tree.
>>>>
>>>> I dropped the xen-tip tree for today (see other conflict reports),
>>>> please get together and sort these out, thanks.
>>>>
>>>
>>> Hmm, seems to be a rather bad timing for the series of Vitaly.
>>>
>>> What is the best way to resolve those conflicts? A rebase of Vitaly's
>>> patches seems to be required in any case.
>>>
>>> Should I rebase the Xen tree on current tip? This seems to be rather
>>> easy, but I think this will work only if I can be sure the current tip
>>> tree contents will all be merged by Linus before the Xen tree.
>> 
>> That's certainly very likely, -tip trees all go in very early in the merge window.
>> 
>>> I could try to cherry pick the patches from tip where Vitaly's patches
>>> have conflicts with, but I think this could lead to a lot of patches
>>> to take.
>> 
>> Nor is it desirable as a workflow.
>> 
>> I'd suggest the following: in about a week I can guarantee a working tip:x86/mm 
>> base with most of the 5-level paging patches applied that you could base Xen 
>> patches on.
>> 
>> Unfortunately, right now there's at least one regression with those changes that 
>> needs to be properly fixed before it's a suitable base tree. The fix already 
>> exists, it just needs to be tested and the whole tree needs to cook for a few days 
>> to be dependable for Xen as a base.
>> 
>>> Or we could delay Vitaly's series until tip has been merged, but this
>>> will either delay some other Xen patches depending on (or conflicting
>>> with) Vitaly's patches or would make the rebase for Vitaly more
>>> difficult.
>> 
>> So my suggestion would be: could you delay 75cd32d6093e for a week, and then merge 
>> it on top of a pulled in tip:x86/mm? I'll send that tree to Linus on the first day 
>> of the merge window so there shouldn't be any ordering problems.
>
> Okay, that's rather easy to do.
>
> Boris, I renamed the current Xen for-linus-4.12 branch for easy
> development of other Xen patches to for-linus-4.12-pre.
>
> I'll create another branch for-linus-4.12 based on the tip tree next
> week which will be subject to the pull request for Linus. As soon as
> for-linus-4.12 is ready the for-linus-4.12-pre branch shouldn't be used
> any longer.

Please let me know if/when I need to rebase my series. I'll rebase, test
and re-send.

Thanks!

-- 
  Vitaly