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rcu: permit suppressing current grace period's CPU stall warnings

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When using a kernel debugger, a long sojourn in the debugger can get
you lots of RCU CPU stall warnings once you resume.  This might not be
helpful, especially if you are using the system console.  This patch
therefore allows RCU CPU stall warnings to be suppressed, but only for
the duration of the current set of grace periods.

This differs from Jason's original patch in that it adds support for
tiny RCU and preemptible RCU, and uses a slightly different method for
suppressing the RCU CPU stall warning messages.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Jason Wessel <jason.wessel@windriver.com>
This commit is contained in:
Paul E. McKenney
2010-08-10 14:28:53 -07:00
parent 8cdd32a918
commit 53d84e004d
5 changed files with 44 additions and 0 deletions
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4
include/linux/rcutiny.h
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@@ -178,6 +178,10 @@ static inline void rcu_sched_force_quiescent_state(void)
{
}
static inline void rcu_cpu_stall_reset(void)
{
}
#ifdef CONFIG_DEBUG_LOCK_ALLOC
extern int rcu_scheduler_active __read_mostly;