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

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Date:   Wed, 11 Mar 2020 22:25:31 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Arvind Sankar <nivedita@...m.mit.edu>,
        Borislav Petkov <bp@...en8.de>
Cc:     kbuild test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "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 3/11/20 10:20 PM, Arvind Sankar wrote:
> On Wed, Mar 11, 2020 at 09:49:54PM +0100, Borislav Petkov wrote:
>> On Sat, Feb 29, 2020 at 07:12:57PM +0100, Hans de Goede wrote:
>>> 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...
>>
>> ... and break the build? I don't think so.
>>
>> I know, it would fail silently now but I don't recall anyone complaining
>> about it. So it was a don't care so far.
>>
>> IOW, first this ftrace_likely_update thing needs to be sorted out and
>> then this merged.
>>
>> Thx.
>>
>> -- 
>> Regards/Gruss,
>>      Boris.
>>
>> https://people.kernel.org/tglx/notes-about-netiquette
> 
> Hans, I think adding -DDISABLE_BRANCH_PROFILING to PURGATORY_CFLAGS
> might fix this.

Yes I was just looking into doing that myself, I agree that that
should fix this. I will mail out a new patch-series with that as
preparation patch soon.

Regards,

Hans