linux-kernel - Re: [PATCH v5 03/10] kexec_file: factor out arch_kexec_kernel

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Date:   Thu, 19 Oct 2017 13:36:14 +0900
From:   AKASHI Takahiro <takahiro.akashi@...aro.org>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, catalin.marinas@....com, will.deacon@....com,
        bauerman@...ux.vnet.ibm.com, dhowells@...hat.com,
        vgoyal@...hat.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, akpm@...ux-foundation.org, mpe@...erman.id.au,
        dyoung@...hat.com, bhe@...hat.com, arnd@...db.de,
        ard.biesheuvel@...aro.org, julien.thierry@....com,
        kexec@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 03/10] kexec_file: factor out arch_kexec_kernel_*()
 from x86, powerpc

On Sat, Oct 14, 2017 at 07:37:04PM +0800, kbuild test robot wrote:
> Hi AKASHI,
> 
> [auto build test WARNING on arm64/for-next/core]
> [also build test WARNING on v4.14-rc4 next-20171013]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
> 
> url:    https://github.com/0day-ci/linux/commits/AKASHI-Takahiro/arm64-kexec-add-kexec_file_load-support/20171012-003448
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
> config: x86_64-randconfig-in0-10141752 (attached as .config)
> compiler: gcc-4.6 (Debian 4.6.4-7) 4.6.4
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=x86_64 
> 
> All warnings (new ones prefixed by >>):
> 
> >> kernel/kexec_file.o: warning: objtool: _kexec_kernel_image_load()+0x31: unsupported stack register modification

I talked to Josh (objtool maintainer) and confirmed this is an issue
of objtool, not a bug in my patch.

-Takahiro AKASHI

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