Messages in this thread | | | Subject | Re: [PATCH 4.4-rc5 v22 4/4] ARM: Allow IPI_CPU_BACKTRACE to exploit FIQ | From | Daniel Thompson <> | Date | Mon, 4 Jan 2016 10:05:57 +0000 |
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On 20/12/15 22:52, kbuild test robot wrote: > Hi Daniel, > > [auto build test ERROR on v4.4-rc5] > [also build test ERROR on next-20151218] > [cannot apply to tip/irq/core] > > url: https://github.com/0day-ci/linux/commits/Daniel-Thompson/irq-arm-Use-FIQ-for-NMI-backtrace-when-possible/20151221-045854 > config: arm-socfpga_defconfig (attached as .config) > reproduce: > wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # save the attached .config to linux build tree > make.cross ARCH=arm > > All error/warnings (new ones prefixed by >>): > > In file included from include/uapi/linux/stddef.h:1:0, > from include/linux/stddef.h:4, > from include/uapi/linux/posix_types.h:4, > from include/uapi/linux/types.h:13, > from include/linux/types.h:5, > from include/linux/list.h:4, > from include/linux/module.h:9, > from arch/arm/kernel/smp.c:10: > arch/arm/kernel/smp.c: In function 'raise_nmi': >>> include/linux/compiler.h:484:38: error: call to '__compiletime_assert_766' declared with attribute error: BUILD_BUG_ON failed: SMP_IPI_FIQ_MASK != BIT(IPI_CPU_BACKTRACE) > _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) > ^ > include/linux/compiler.h:467:4: note: in definition of macro '__compiletime_assert' > prefix ## suffix(); \ > ^ > include/linux/compiler.h:484:2: note: in expansion of macro '_compiletime_assert' > _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) > ^ > include/linux/bug.h:50:37: note: in expansion of macro 'compiletime_assert' > #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) > ^ > include/linux/bug.h:74:2: note: in expansion of macro 'BUILD_BUG_ON_MSG' > BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) > ^ >>> arch/arm/kernel/smp.c:766:2: note: in expansion of macro 'BUILD_BUG_ON' > BUILD_BUG_ON(SMP_IPI_FIQ_MASK != BIT(IPI_CPU_BACKTRACE));
This should be a false alarm or at least, the BUILD_BUG_ON() is doing exactly what it was intended to.
I forgot to mention it in the covering letter (and will fix next time) but my patchset requires a fix from Marc Zyngier which changes the numeric value of IPI_CPU_BACKTRACE[1].
Daniel.
1: http://thread.gmane.org/gmane.linux.ports.arm.kernel/464985
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