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SubjectRe: [PATCH v5 3/3] locking/mutex: Ensure forward progress of waiter-spinner
Hi Waiman,

[auto build test ERROR on tip/locking/core]
[also build test ERROR on v4.8-rc1]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Waiman-Long/locking-mutex-Enable-optimistic-spinning-of-lock-waiter/20160811-074736
config: arm-sunxi_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 5.4.0-6) 5.4.0 20160609
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/linux/compiler.h:58:0,
from include/uapi/linux/stddef.h:1,
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/thread_info.h:10,
from include/asm-generic/current.h:4,
from ./arch/arm/include/generated/asm/current.h:1,
from include/linux/mutex.h:13,
from kernel/locking/mutex.c:20:
kernel/locking/mutex.c: In function 'mutex_optimistic_spin':
>> include/linux/compiler-gcc.h:15:19: error: expected expression before '__asm__'
#define barrier() __asm__ __volatile__("": : :"memory")
^
>> arch/arm/include/asm/processor.h:82:23: note: in expansion of macro 'barrier'
#define cpu_relax() barrier()
^
>> arch/arm/include/asm/processor.h:85:47: note: in expansion of macro 'cpu_relax'
#define cpu_relax_lowlatency() cpu_relax()
^
>> kernel/locking/mutex.c:355:10: note: in expansion of macro 'cpu_relax_lowlatency'
for (;; cpu_relax_lowlatency()) {
^

vim +/cpu_relax +85 arch/arm/include/asm/processor.h

^1da177e4 include/asm-arm/processor.h Linus Torvalds 2005-04-16 76
^1da177e4 include/asm-arm/processor.h Linus Torvalds 2005-04-16 77 unsigned long get_wchan(struct task_struct *p);
^1da177e4 include/asm-arm/processor.h Linus Torvalds 2005-04-16 78
5dab26af1 arch/arm/include/asm/processor.h Will Deacon 2011-03-04 79 #if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
534be1d5a arch/arm/include/asm/processor.h Will Deacon 2010-06-21 80 #define cpu_relax() smp_mb()
534be1d5a arch/arm/include/asm/processor.h Will Deacon 2010-06-21 81 #else
^1da177e4 include/asm-arm/processor.h Linus Torvalds 2005-04-16 @82 #define cpu_relax() barrier()
534be1d5a arch/arm/include/asm/processor.h Will Deacon 2010-06-21 83 #endif
^1da177e4 include/asm-arm/processor.h Linus Torvalds 2005-04-16 84
3a6bfbc91 arch/arm/include/asm/processor.h Davidlohr Bueso 2014-06-29 @85 #define cpu_relax_lowlatency() cpu_relax()
3a6bfbc91 arch/arm/include/asm/processor.h Davidlohr Bueso 2014-06-29 86
815d5ec86 include/asm-arm/processor.h Al Viro 2006-01-12 87 #define task_pt_regs(p) \
32d39a935 include/asm-arm/processor.h Al Viro 2006-01-12 88 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)

:::::: The code at line 85 was first introduced by commit
:::::: 3a6bfbc91df04b081a44d419e0260bad54abddf7 arch, locking: Ciao arch_mutex_cpu_relax()

:::::: TO: Davidlohr Bueso <davidlohr@hp.com>
:::::: CC: Ingo Molnar <mingo@kernel.org>

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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