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| author | Peter Zijlstra <peterz@infradead.org> | 2018-05-22 19:50:53 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-05-23 02:12:26 +0300 |
| commit | f64c6013a2029316ea552f99823d116ee5f5f955 (patch) | |
| tree | 07426bae4e4500acc8bc64a0edd0c6fe6b298e6e /include/linux/rcutiny.h | |
| parent | 22df7316ac71dc1ac57415349938737d2a229c59 (diff) | |
| download | linux-f64c6013a2029316ea552f99823d116ee5f5f955.tar.xz | |
rcu/x86: Provide early rcu_cpu_starting() callback
The x86/mtrr code does horrific things because hardware. It uses
stop_machine_from_inactive_cpu(), which does a wakeup (of the stopper
thread on another CPU), which uses RCU, all before the CPU is onlined.
RCU complains about this, because wakeups use RCU and RCU does
(rightfully) not consider offline CPUs for grace-periods.
Fix this by initializing RCU way early in the MTRR case.
Tested-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Add !SMP support, per 0day Test Robot report. ]
Diffstat (limited to 'include/linux/rcutiny.h')
| -rw-r--r-- | include/linux/rcutiny.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h index ce9beec35e34..7b3c82e8a625 100644 --- a/include/linux/rcutiny.h +++ b/include/linux/rcutiny.h @@ -132,5 +132,6 @@ static inline void rcu_all_qs(void) { barrier(); } #define rcutree_offline_cpu NULL #define rcutree_dead_cpu NULL #define rcutree_dying_cpu NULL +static inline void rcu_cpu_starting(unsigned int cpu) { } #endif /* __LINUX_RCUTINY_H */ |