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 <[email protected]>
:::::: CC: Linus Torvalds <[email protected]>
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