Messages in this thread | | | From | Arnd Bergmann <> | Date | Wed, 22 Mar 2017 22:27:12 +0100 | Subject | Re: [PATCH] asm-generic: fix compilation failure in cmpxchg_double() |
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On Wed, Mar 22, 2017 at 12:27 PM, Arnd Bergmann <arnd@arndb.de> wrote: > On Wed, Mar 22, 2017 at 12:10 PM, Dmitry Vyukov <dvyukov@google.com> wrote: >> Arnd reported that the new code leads to compilation failures >> with some versions of gcc. I've filed gcc issue 72873, >> but we need a kernel fix as well. >> >> Remove instrumentation from cmpxchg_double() for now. > > Thanks, I also checked that fixes the build error for me.
I got a new variant of the bug in arch/x86/include/asm/cmpxchg_32.h:set_64bit() now.
In file included from /git/arm-soc/arch/x86/include/asm/cmpxchg.h:142:0, from /git/arm-soc/arch/x86/include/asm/atomic.h:7, from /git/arm-soc/arch/x86/include/asm/msr.h:66, from /git/arm-soc/arch/x86/include/asm/processor.h:20, from /git/arm-soc/arch/x86/include/asm/cpufeature.h:4, from /git/arm-soc/arch/x86/include/asm/thread_info.h:52, from /git/arm-soc/include/linux/thread_info.h:25, from /git/arm-soc/arch/x86/include/asm/preempt.h:6, from /git/arm-soc/include/linux/preempt.h:80, from /git/arm-soc/include/linux/spinlock.h:50, from /git/arm-soc/include/linux/mmzone.h:7, from /git/arm-soc/include/linux/gfp.h:5, from /git/arm-soc/include/linux/mm.h:9, from /git/arm-soc/mm/khugepaged.c:3: /git/arm-soc/mm/khugepaged.c: In function 'khugepaged': /git/arm-soc/arch/x86/include/asm/cmpxchg_32.h:29:2: error: 'asm' operand has impossible constraints asm volatile("\n1:\t"
Defconfig is at http://pastebin.com/raw/Pthhv5iU
Arnd
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