From: daniel.thompson@linaro.org (Daniel Thompson)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 4.4-rc5 v22 4/4] ARM: Allow IPI_CPU_BACKTRACE to exploit FIQ
Date: Mon, 4 Jan 2016 10:05:57 +0000 [thread overview]
Message-ID: <568A4405.50807@linaro.org> (raw)
In-Reply-To: <201512210611.VZD43TTL%fengguang.wu@intel.com>
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
prev parent reply other threads:[~2016-01-04 10:05 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-20 20:52 [PATCH 4.4-rc5 v22 0/4] irq/arm: Use FIQ for NMI backtrace (when possible) Daniel Thompson
2015-12-20 20:52 ` [PATCH 4.4-rc5 v22 1/4] irqchip: gic: Optimize locking in gic_raise_softirq Daniel Thompson
2016-01-07 14:31 ` Marc Zyngier
2015-12-20 20:52 ` [PATCH 4.4-rc5 v22 2/4] irqchip: gic: Make gic_raise_softirq FIQ-safe Daniel Thompson
2016-01-07 14:35 ` Marc Zyngier
2015-12-20 20:52 ` [PATCH 4.4-rc5 v22 3/4] irqchip: gic: Introduce plumbing for IPI FIQ Daniel Thompson
2016-01-07 17:06 ` Marc Zyngier
2016-01-11 12:02 ` Daniel Thompson
2015-12-20 20:52 ` [PATCH 4.4-rc5 v22 4/4] ARM: Allow IPI_CPU_BACKTRACE to exploit FIQ Daniel Thompson
2015-12-20 22:12 ` kbuild test robot
2016-01-04 10:00 ` Daniel Thompson
2015-12-20 22:52 ` kbuild test robot
2016-01-04 10:05 ` Daniel Thompson [this message]
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