Messages in this thread | | | Date | Fri, 5 May 2017 06:50:32 +0800 | From | kbuild test robot <> | Subject | [rcu:rcu/dev 90/90] include/linux/bit_spinlock.h:29:4: error: implicit declaration of function 'cpu_relax' |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev head: 894c3990aadbe57e0e87f9d18307fa2a4e27af7f commit: 894c3990aadbe57e0e87f9d18307fa2a4e27af7f [90/90] fixup! rcu: Move ktime needs to rcutiny.h and remove ktime.h from rcupdate.h config: sparc64-defconfig (attached as .config) compiler: sparc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705 reproduce: wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 894c3990aadbe57e0e87f9d18307fa2a4e27af7f # save the attached .config to linux build tree make.cross ARCH=sparc64
All errors (new ones prefixed by >>):
In file included from include/linux/list_bl.h:5:0, from include/linux/rculist_bl.h:7, from include/linux/dcache.h:7, from fs/notify/fsnotify.c:19: include/linux/bit_spinlock.h: In function 'bit_spin_lock': >> include/linux/bit_spinlock.h:29:4: error: implicit declaration of function 'cpu_relax' [-Werror=implicit-function-declaration] cpu_relax(); ^~~~~~~~~ cc1: some warnings being treated as errors
vim +/cpu_relax +29 include/linux/bit_spinlock.h
fb1c8f93 Ingo Molnar 2005-09-10 13 * are significantly faster. fb1c8f93 Ingo Molnar 2005-09-10 14 */ fb1c8f93 Ingo Molnar 2005-09-10 15 static inline void bit_spin_lock(int bitnum, unsigned long *addr) fb1c8f93 Ingo Molnar 2005-09-10 16 { fb1c8f93 Ingo Molnar 2005-09-10 17 /* fb1c8f93 Ingo Molnar 2005-09-10 18 * Assuming the lock is uncontended, this never enters fb1c8f93 Ingo Molnar 2005-09-10 19 * the body of the outer loop. If it is contended, then fb1c8f93 Ingo Molnar 2005-09-10 20 * within the inner loop a non-atomic test is used to fb1c8f93 Ingo Molnar 2005-09-10 21 * busywait with less bus contention for a good time to fb1c8f93 Ingo Molnar 2005-09-10 22 * attempt to acquire the lock bit. fb1c8f93 Ingo Molnar 2005-09-10 23 */ fb1c8f93 Ingo Molnar 2005-09-10 24 preempt_disable(); fb1c8f93 Ingo Molnar 2005-09-10 25 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) b8dc93cb Nick Piggin 2007-10-18 26 while (unlikely(test_and_set_bit_lock(bitnum, addr))) { fb1c8f93 Ingo Molnar 2005-09-10 27 preempt_enable(); 3dd2ee48 Linus Torvalds 2011-04-25 28 do { fb1c8f93 Ingo Molnar 2005-09-10 @29 cpu_relax(); 3dd2ee48 Linus Torvalds 2011-04-25 30 } while (test_bit(bitnum, addr)); fb1c8f93 Ingo Molnar 2005-09-10 31 preempt_disable(); fb1c8f93 Ingo Molnar 2005-09-10 32 } fb1c8f93 Ingo Molnar 2005-09-10 33 #endif fb1c8f93 Ingo Molnar 2005-09-10 34 __acquire(bitlock); fb1c8f93 Ingo Molnar 2005-09-10 35 } fb1c8f93 Ingo Molnar 2005-09-10 36 fb1c8f93 Ingo Molnar 2005-09-10 37 /*
:::::: The code at line 29 was first introduced by commit :::::: fb1c8f93d869b34cacb8b8932e2b83d96a19d720 [PATCH] spinlock consolidation
:::::: TO: Ingo Molnar <mingo@elte.hu> :::::: CC: Linus Torvalds <torvalds@g5.osdl.org>
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