linux-kernel - Re: stable 4.16.5 hmm build error

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Date:   Fri, 27 Apr 2018 10:44:58 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Михаил Носов <drdeimosnn@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jérôme Glisse <jglisse@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: stable 4.16.5 hmm build error

On Fri, Apr 27, 2018 at 10:30 AM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> On Fri, Apr 27, 2018 at 10:17:42AM +0200, Arnd Bergmann wrote:
>> On Fri, Apr 27, 2018 at 9:30 AM, Greg Kroah-Hartman
>>
>> which you backported as 25df8b83e867 into linux-4.16.y after v4.16.4.
>> After that originally landed in mainline, I found another build error that
>> I fixed with commit
>>
>> 9d8a463a7016 ("mm/hmm: fix header file if/else/endif maze, again")
>
> Why does that commit reference:
>     Fixes: 8900d06a277a ("mm/hmm: fix header file if/else/endif maze")
>
> when there is no such commit in the tree?

This must have happened when the commit that introduced it came through
the -mm tree and got a new commit ID between the time I sent the fix
and Linus picking up the patch from Andrew. I try to hand-edit the
'Fixes' line when I know it's a patch in -mm to say 'Fixes: mmotm ("...")'
but I missed that his time.

>> This fixes the issue that Randy is reporting now, please add that into
>> v4.16.5.
>
> I tried, but it does not apply cleanly:
>         $ p1 < ../mm-hmm-fix-header-file-if-else-endif-maze-again.patch
>         checking file include/linux/hmm.h
>         Hunk #1 FAILED at 376.
>         Hunk #2 succeeded at 498 (offset -52 lines).
>         1 out of 2 hunks FAILED
>
> Am I missing some other commit that went in inbetween the above patches?

There were several other commits from Jérôme inbetween. I don't
immediately see where the conflict came from, but as my patch is
basically a revert of Jérôme's, and it was working in v4.16.4, maybe
it's best if you drop the backport of b28b08de436a for now, let him
comment on whether we still need it. I had not seen the build error
he referred to in his commit and we know that it does cause a
new one.

      Arnd