[linux-stable-rc:linux-4.14.y 9946/9999] WARNING: vmlinux.o(.text+0x213438): Section mismatch in reference from the function __rmqueue() to the function .meminit.text:zone_pcp_update()

[linux-stable-rc:linux-4.14.y 9946/9999] WARNING: vmlinux.o(.text+0x213438): Section mismatch in reference from the function __rmqueue() to the function .meminit.text:zone_pcp_update()

[kbuild test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.14.y
head:   0d12dcf336c606a37cf2ad4319bc59f69eb6c255
commit: 88284ade98e99e3e391c90b51b8b7420953071d4 [9946/9999] mm, meminit: recalculate pcpu batch and high limits after init completes
config: sparc64-allmodconfig (attached as .config)
compiler: sparc64-linux-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 88284ade98e99e3e391c90b51b8b7420953071d4
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=sparc64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> WARNING: vmlinux.o(.text+0x213438): Section mismatch in reference from the function __rmqueue() to the function .meminit.text:zone_pcp_update()
   The function __rmqueue() references
   the function __meminit zone_pcp_update().
   This is often because __rmqueue lacks a __meminit
   annotation or the annotation of zone_pcp_update is wrong.

---
0-DAY kernel test infrastructure                 Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation

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Re: [linux-stable-rc:linux-4.14.y 9946/9999] WARNING: vmlinux.o(.text+0x213438): Section mismatch in reference from the function __rmqueue() to the function .meminit.text:zone_pcp_update()

[Mel Gorman]

On Tue, Nov 12, 2019 at 02:57:23AM +0800, kbuild test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.14.y
> head:   0d12dcf336c606a37cf2ad4319bc59f69eb6c255
> commit: 88284ade98e99e3e391c90b51b8b7420953071d4 [9946/9999] mm, meminit: recalculate pcpu batch and high limits after init completes
> config: sparc64-allmodconfig (attached as .config)
> compiler: sparc64-linux-gcc (GCC) 7.4.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         git checkout 88284ade98e99e3e391c90b51b8b7420953071d4
>         # save the attached .config to linux build tree
>         GCC_VERSION=7.4.0 make.cross ARCH=sparc64 
> 
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@intel.com>
> 
> All warnings (new ones prefixed by >>):
> 
> >> WARNING: vmlinux.o(.text+0x213438): Section mismatch in reference from the function __rmqueue() to the function .meminit.text:zone_pcp_update()
>    The function __rmqueue() references
>    the function __meminit zone_pcp_update().
>    This is often because __rmqueue lacks a __meminit
>    annotation or the annotation of zone_pcp_update is wrong.
> 

Greg,

It's probably best to drop this patch from 4.14-stable for now. In theory,
4.14-stable is affected but deferred meminit went through a lot of changes
and it hasn't been proven it is definitely necessary. I know at least
that a 4.12-based distribution kernel is not affected by the bug but
didn't isolate why given that 4.12-vanilla failed to boot on the test
machines I had access to.

-- 
Mel Gorman
SUSE Labs

Re: [linux-stable-rc:linux-4.14.y 9946/9999] WARNING: vmlinux.o(.text+0x213438): Section mismatch in reference from the function __rmqueue() to the function .meminit.text:zone_pcp_update()

[Greg Kroah-Hartman]

On Tue, Nov 12, 2019 at 08:58:14AM +0000, Mel Gorman wrote:
> On Tue, Nov 12, 2019 at 02:57:23AM +0800, kbuild test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.14.y
> > head:   0d12dcf336c606a37cf2ad4319bc59f69eb6c255
> > commit: 88284ade98e99e3e391c90b51b8b7420953071d4 [9946/9999] mm, meminit: recalculate pcpu batch and high limits after init completes
> > config: sparc64-allmodconfig (attached as .config)
> > compiler: sparc64-linux-gcc (GCC) 7.4.0
> > reproduce:
> >         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> >         chmod +x ~/bin/make.cross
> >         git checkout 88284ade98e99e3e391c90b51b8b7420953071d4
> >         # save the attached .config to linux build tree
> >         GCC_VERSION=7.4.0 make.cross ARCH=sparc64 
> > 
> > If you fix the issue, kindly add following tag
> > Reported-by: kbuild test robot <lkp@intel.com>
> > 
> > All warnings (new ones prefixed by >>):
> > 
> > >> WARNING: vmlinux.o(.text+0x213438): Section mismatch in reference from the function __rmqueue() to the function .meminit.text:zone_pcp_update()
> >    The function __rmqueue() references
> >    the function __meminit zone_pcp_update().
> >    This is often because __rmqueue lacks a __meminit
> >    annotation or the annotation of zone_pcp_update is wrong.
> > 
> 
> Greg,
> 
> It's probably best to drop this patch from 4.14-stable for now. In theory,
> 4.14-stable is affected but deferred meminit went through a lot of changes
> and it hasn't been proven it is definitely necessary. I know at least
> that a 4.12-based distribution kernel is not affected by the bug but
> didn't isolate why given that 4.12-vanilla failed to boot on the test
> machines I had access to.

It's been dropped already from 4.14.y, 4.9.y, and 4.4.y as the backports
I did were totally wrong (ugh, fuzz), and things like this blew up.

I'll not worry about doing the backport correct later now that you
mention this, thanks for letting me know!

greg k-h