diff options
| author | Rik van Riel | 2014-04-27 08:15:35 +0200 |
|---|---|---|
| committer | Paul E. McKenney | 2014-05-19 19:52:04 +0200 |
| commit | 61f38db3e3c0e4c3be0858750e2cabeadaecac0c (patch) | |
| tree | 5ded19f41e8ceb49a55b2942fb0a5774a95126d1 /include/linux/rcupdate.h | |
| parent | rcu: Variable name changed in tree_plugin.h and used in tree.c (diff) | |
| download | kernel-qcow2-linux-61f38db3e3c0e4c3be0858750e2cabeadaecac0c.tar.gz kernel-qcow2-linux-61f38db3e3c0e4c3be0858750e2cabeadaecac0c.tar.xz kernel-qcow2-linux-61f38db3e3c0e4c3be0858750e2cabeadaecac0c.zip | |
rcu: Provide API to suppress stall warnings while sysrc runs
Some sysrq handlers can run for a long time, because they dump a lot
of data onto a serial console. Having RCU stall warnings pop up in
the middle of them only makes the problem worse.
This commit provides rcu_sysrq_start() and rcu_sysrq_end() APIs to
temporarily suppress RCU CPU stall warnings while a sysrq request is
handled.
Signed-off-by: Rik van Riel <riel@redhat.com>
[ paulmck: Fix TINY_RCU build error. ]
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/rcupdate.h')
| -rw-r--r-- | include/linux/rcupdate.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index 9ccd644c1234..5a75d19aa661 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -248,6 +248,18 @@ void rcu_idle_exit(void); void rcu_irq_enter(void); void rcu_irq_exit(void); +#ifdef CONFIG_RCU_STALL_COMMON +void rcu_sysrq_start(void); +void rcu_sysrq_end(void); +#else /* #ifdef CONFIG_RCU_STALL_COMMON */ +static inline void rcu_sysrq_start(void) +{ +} +static inline void rcu_sysrq_end(void) +{ +} +#endif /* #else #ifdef CONFIG_RCU_STALL_COMMON */ + #ifdef CONFIG_RCU_USER_QS void rcu_user_enter(void); void rcu_user_exit(void); |