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Re: 'kbuild' merge before 4.9-rc1 breaks build and boot

From Peter Wu <peter@lekensteyn.nl>
Newsgroups linux.kernel
Subject Re: 'kbuild' merge before 4.9-rc1 breaks build and boot
Date 2016-11-07 22:40 +0100
Message-ID <sAZO2-ic-31@gated-at.bofh.it> (permalink)
References <suKRH-87U-13@gated-at.bofh.it> <swWlH-4Lb-27@gated-at.bofh.it> <sAXCy-7rh-29@gated-at.bofh.it>
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On Mon, Nov 07, 2016 at 02:10:12PM -0500, Vince Weaver wrote:
> On Thu, 27 Oct 2016, Peter Wu wrote:
> 
> > I can confirm Olivers issue, the current mainline kernel fails to boot
> > on kernels with CONFIG_MODVERSIONS=y. Bisection points to:
> > 
> >     commit 784d5699eddc55878627da20d3fe0c8542e2f1a2
> >     Author: Al Viro <viro@zeniv.linux.org.uk>
> >     Date:   Mon Jan 11 11:04:34 2016 -0500
> > > WARNING: "memset" [sound/usb/snd-usbmidi-lib.ko] has no CRC!
> > > WARNING: "__fentry__" [sound/usb/snd-usbmidi-lib.ko] has no CRC!
> > > WARNING: "memcpy" [sound/usb/snd-usbmidi-lib.ko] has no CRC!
> > > WARNING: "__sw_hweight32" [sound/usb/snd-usbmidi-lib.ko] has no CRC!
> 
> Has any progress been made with this problem?
> 
> I'm also encountering it on my debian-unstable box on any kernel more 
> recent than 4.9-rc1 (up to and including 4.9-rc4).  I am glad someone 
> managed to isolate it as I was unable to get a clean bisect.
> 
> Vince

The original kbuild issue went in via
merge commit 84d69848c97faab0c25aa2667b273404d2e2a64a which notes:

 - EXPORT_SYMBOL for asm source by Al Viro.

   This does bring a regression, because genksyms no longer generates
   checksums for these symbols (CONFIG_MODVERSIONS). Nick Piggin is
   working on a patch to fix this.

   Plus, we are talking about functions like strcpy(), which rarely
   change prototypes.

Adding Nicholas in the cc, hopefully he can give a status update.

Kind regards,
Peter

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Thread

Re: 'kbuild' merge before 4.9-rc1 breaks build and boot Peter Wu <peter@lekensteyn.nl> - 2016-10-27 19:10 +0200
  Re: 'kbuild' merge before 4.9-rc1 breaks build and boot Vince Weaver <vincent.weaver@maine.edu> - 2016-11-07 20:20 +0100
    Re: 'kbuild' merge before 4.9-rc1 breaks build and boot Peter Wu <peter@lekensteyn.nl> - 2016-11-07 22:40 +0100
      Re: 'kbuild' merge before 4.9-rc1 breaks build and boot Nicholas Piggin <npiggin@gmail.com> - 2016-11-08 03:00 +0100

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