linux-kernel - Re: Odd build breakage in 4.9-rc7

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Message-ID: <CA+55aFyPhpYQR-a+PNcDSNBTaRk5CeWAwynSp2QUcStfWazTZA@mail.gmail.com>
Date:   Wed, 30 Nov 2016 10:36:05 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Prarit Bhargava <prarit@...hat.com>
Cc:     Jarod Wilson <jarod@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tony Luck <tony.luck@...el.com>, zarniwhoop73@...glemail.com,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: Odd build breakage in 4.9-rc7

On Wed, Nov 30, 2016 at 10:28 AM, Prarit Bhargava <prarit@...hat.com> wrote:
]>
> In my case I tracked this to commit 3637efb00864 ("x86/mce: Add PCI quirks to
> identify Xeons with machine check recovery") which adds the include for
> generated/autoksyms.h.

Ok, that at least makes some sense. The other blamed commit did not
seem to possibly make a difference.

> Searching LKML and I came across a report from Ken Moffat from a month ago:
>
> http://marc.info/?l=linux-kernel&m=147794681124332&w=2

Does a "make clean" get rid of it forever? Or does it come back?

If it's a one-time dependency issue that is because some header
dependency addition that the automatic dependency generator hadn't
caught, that might explain a bisection failure too: once the file
happens to get rebuilt (and the dependencies re-done), it starts
working even though the "happens to be rebuilt" had nothing to do with
the original bug.

               Linus