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Date:   Wed, 16 Dec 2020 23:37:48 +0800
From:   kernel test robot <>
To:     Uros Bizjak <>,,,
Cc:, Uros Bizjak <>,
        Thomas Gleixner <>,
        Ingo Molnar <>, Borislav Petkov <>,
        "H. Peter Anvin" <>
Subject: Re: [PATCH 2/3] locking/atomic/x86: Introduce arch_try_cmpxchg64()

Hi Uros,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/master]
[also build test ERROR on next-20201215]
[cannot apply to tip/x86/core kvm/linux-next v5.10]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in]

base: d1c29f5debd4633eb0e9ea1bc00aaad48b077a9b
config: i386-tinyconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        git remote add linux-review
        git fetch --no-tags linux-review Uros-Bizjak/x86-KVM-VMX-Introduce-and-use-try_cmpxchg64/20201216-024049
        git checkout 60a11e7e63e120b5fd41b5346cf5a05ea71c7cb2
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <>

All errors (new ones prefixed by >>):

   ld: arch/x86/events/core.o: in function `x86_perf_event_update':
>> core.c:(.text+0x847): undefined reference to `cmpxchg8b_emu'
   ld: kernel/sched/clock.o: in function `sched_clock_local.constprop.0':
>> clock.c:(.text+0x1b4): undefined reference to `cmpxchg8b_emu'
   ld: kernel/sched/clock.o: in function `sched_clock_cpu':
   clock.c:(.text+0x293): undefined reference to `cmpxchg8b_emu'
>> ld: clock.c:(.text+0x2e3): undefined reference to `cmpxchg8b_emu'
   ld: kernel/events/core.o: in function `perf_swevent_set_period':
   core.c:(.text+0x8cbb): undefined reference to `cmpxchg8b_emu'
   ld: fs/inode.o:inode.c:(.text+0x10ca): more undefined references to `cmpxchg8b_emu' follow

0-DAY CI Kernel Test Service, Intel Corporation

Download attachment ".config.gz" of type "application/gzip" (7282 bytes)

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