Hi Jason, [auto build test WARNING on tip/locking/core] [also build test WARNING on v4.8-rc1 next-20160809] [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/Jason-Low/locking-mutex-Prevent-lock-starvation-when-spinning-is-enabled/20160811-034327 config: m68k-allyesconfig (attached as .config) compiler: m68k-linux-gcc (GCC) 4.9.0 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=m68k All warnings (new ones prefixed by >>): kernel/locking/mutex.c: In function 'do_yield_to_waiter': kernel/locking/mutex.c:441:10: error: 'struct mutex' has no member named 'yield_to_waiter' if (lock->yield_to_waiter != true) ^ kernel/locking/mutex.c:442:7: error: 'struct mutex' has no member named 'yield_to_waiter' lock->yield_to_waiter = true; ^ kernel/locking/mutex.c: In function 'clear_yield_to_waiter': kernel/locking/mutex.c:447:6: error: 'struct mutex' has no member named 'yield_to_waiter' lock->yield_to_waiter = false; ^ kernel/locking/mutex.c: In function 'need_yield_to_waiter': kernel/locking/mutex.c:452:13: error: 'struct mutex' has no member named 'yield_to_waiter' return lock->yield_to_waiter; ^ kernel/locking/mutex.c: In function '__ww_mutex_lock': >> kernel/locking/mutex.c:983:7: warning: passing argument 1 of >> 'need_yield_to_waiter' from incompatible pointer type if (!need_yield_to_waiter(lock)) ^ kernel/locking/mutex.c:450:20: note: expected 'struct mutex *' but argument is of type 'struct ww_mutex *' static inline bool need_yield_to_waiter(struct mutex *lock) ^ kernel/locking/mutex.c: In function '__ww_mutex_lock_interruptible': kernel/locking/mutex.c:1002:7: warning: passing argument 1 of 'need_yield_to_waiter' from incompatible pointer type if (!need_yield_to_waiter(lock)) ^ kernel/locking/mutex.c:450:20: note: expected 'struct mutex *' but argument is of type 'struct ww_mutex *' static inline bool need_yield_to_waiter(struct mutex *lock) ^ kernel/locking/mutex.c: In function 'need_yield_to_waiter': kernel/locking/mutex.c:453:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ vim +/need_yield_to_waiter +983 kernel/locking/mutex.c 967 ret = __mutex_fastpath_trylock(&lock->count, __mutex_trylock_slowpath); 968 if (ret) 969 mutex_set_owner(lock); 970 971 return ret; 972 } 973 EXPORT_SYMBOL(mutex_trylock); 974 975 #ifndef CONFIG_DEBUG_LOCK_ALLOC 976 int __sched 977 __ww_mutex_lock(struct ww_mutex *lock, struct ww_acquire_ctx *ctx) 978 { 979 int ret = 1; 980 981 might_sleep(); 982 > 983 if (!need_yield_to_waiter(lock)) 984 ret = __mutex_fastpath_lock_retval(&lock->base.count); 985 986 if (likely(!ret)) { 987 ww_mutex_set_context_fastpath(lock, ctx); 988 mutex_set_owner(&lock->base); 989 } else 990 ret = __ww_mutex_lock_slowpath(lock, ctx); 991 return ret; --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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