[linux-next:master 12298/12332] ./include/generated/atomic-instrumented.h:1776:2: note: in expansion of macro 'arch_cmpxchg_double'

[kbuild test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   a4983672f9ca4c8393f26b6b80710e6c78886b8c
commit: ad5b116bb23dc2ca973692aeada2567ec7724d1e [12298/12332] locking/atomics: build atomic headers as required
config: i386-randconfig-h0-01032225 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout ad5b116bb23dc2ca973692aeada2567ec7724d1e
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   In file included from arch/x86/include/asm/atomic.h:8:0,
                    from arch/x86/include/asm/msr.h:67,
                    from arch/x86/include/asm/processor.h:21,
                    from arch/x86/include/asm/cpufeature.h:5,
                    from arch/x86/include/asm/thread_info.h:53,
                    from include/linux/thread_info.h:38,
                    from arch/x86/include/asm/preempt.h:7,
                    from include/linux/preempt.h:78,
                    from include/linux/spinlock.h:51,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:6,
                    from include/linux/mm.h:10,
                    from mm/slub.c:13:
   mm/slub.c: In function '__slab_free':
   arch/x86/include/asm/cmpxchg.h:245:2: error: 'asm' operand has impossible constraints
     asm volatile(pfx "cmpxchg%c5b %1"    \
     ^
   arch/x86/include/asm/cmpxchg.h:256:2: note: in expansion of macro '__cmpxchg_double'
     __cmpxchg_double(LOCK_PREFIX, p1, p2, o1, o2, n1, n2)
     ^
>> ./include/generated/atomic-instrumented.h:1776:2: note: in expansion of macro 'arch_cmpxchg_double'
     arch_cmpxchg_double(__ai_ptr, __VA_ARGS__);    \
     ^
   mm/slub.c:403:7: note: in expansion of macro 'cmpxchg_double'
      if (cmpxchg_double(&page->freelist, &page->counters,
          ^

---
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