linux-kernel - Re: [PATCH resend] x86/purgatory: Make sure we fail the build if purgatory.ro has missing symbols

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Date:   Sat, 29 Feb 2020 19:12:57 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH resend] x86/purgatory: Make sure we fail the build if
 purgatory.ro has missing symbols

Hi,

On 2/29/20 6:16 PM, kbuild test robot wrote:
> Hi Hans,
> 
> I love your patch! Yet something to improve:
> 
> [auto build test ERROR on tip/x86/core]
> [also build test ERROR on v5.6-rc3 next-20200228]
> [cannot apply to tip/auto-latest]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system. BTW, we also suggest to use '--base' option to specify the
> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
> 
> url:    https://github.com/0day-ci/linux/commits/Hans-de-Goede/x86-purgatory-Make-sure-we-fail-the-build-if-purgatory-ro-has-missing-symbols/20200223-040035
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 248ed51048c40d36728e70914e38bffd7821da57
> config: x86_64-randconfig-s1-20200229 (attached as .config)
> compiler: gcc-4.9 (Debian 4.9.2-10+deb8u1) 4.9.2
> reproduce:
>          # save the attached .config to linux build tree
>          make ARCH=x86_64
> 
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
>     ld: arch/x86/purgatory/purgatory.ro: in function `kstrtoull':
>>> (.text+0x2b0e): undefined reference to `ftrace_likely_update'

AFAICT this is the patch working as intended and pointing out an actual issue
with the purgatory code. Which shows that we really should get this
patch merged...

Regards,

Hans