tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next head: f0909808dc46d6ae79a08a42def577bd7880aa4d commit: 0d6eb99818da24d0c55962c7c0d4a9f8dc71a6bb [19/20] membarrier: Provide register sync core cmd config: xtensa-allyesconfig (attached as .config) compiler: xtensa-linux-gcc (GCC) 4.9.0 reproduce: wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 0d6eb99818da24d0c55962c7c0d4a9f8dc71a6bb # save the attached .config to linux build tree make.cross ARCH=xtensa
All errors (new ones prefixed by >>):
In file included from include/linux/ptrace.h:5:0,
from arch/xtensa/kernel/asm-offsets.c:21:
include/linux/sched.h: In function 'membarrier_sched_out':
>> include/linux/sched.h:1653:3: error: implicit declaration of function
>> 'sync_core' [-Werror=implicit-function-declaration]
sync_core();
^
cc1: some warnings being treated as errors
make[2]: *** [arch/xtensa/kernel/asm-offsets.s] Error 1
make[2]: Target '__build' not remade because of errors.
make[1]: *** [prepare0] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [sub-make] Error 2
vim +/sync_core +1653 include/linux/sched.h
1630
1631 #ifdef CONFIG_MEMBARRIER
1632 static inline void membarrier_fork(struct task_struct *t,
1633 unsigned long clone_flags)
1634 {
1635 /*
1636 * Coherence of membarrier_sync_core against thread fork is
1637 * protected by siglock. membarrier_fork is called with siglock
1638 * held.
1639 */
1640 t->membarrier_sync_core = current->membarrier_sync_core;
1641 }
1642 static inline void membarrier_execve(struct task_struct *t)
1643 {
1644 t->membarrier_sync_core = 0;
1645 }
1646 static inline void membarrier_sched_out(struct task_struct *t)
1647 {
1648 /*
1649 * Core serialization is performed before the memory barrier
1650 * preceding the store to rq->curr.
1651 */
1652 if (unlikely(READ_ONCE(t->membarrier_sync_core)))
> 1653 sync_core();
1654 }
1655 static inline void membarrier_sched_in(struct task_struct *t)
1656 {
1657 /*
1658 * Core serialization is performed after the memory barrier
1659 * following the store to rq->curr.
1660 */
1661 if (unlikely(READ_ONCE(t->membarrier_sync_core)))
1662 sync_core();
1663 }
1664 #else
1665 static inline void membarrier_fork(struct task_struct *t,
1666 unsigned long clone_flags)
1667 {
1668 }
1669 static inline void membarrier_execve(struct task_struct *t)
1670 {
1671 }
1672 static inline void membarrier_sched_out(struct task_struct *t)
1673 {
1674 }
1675 static inline void membarrier_sched_in(struct task_struct *t)
1676 {
1677 }
1678 #endif
1679
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