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rcu: Provide RCU CPU stall warnings for tiny RCU

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Tiny RCU has historically omitted RCU CPU stall warnings in order to
reduce memory requirements, however, lack of these warnings caused
Thomas Gleixner some debugging pain recently.  Therefore, this commit
adds RCU CPU stall warnings to tiny RCU if RCU_TRACE=y.  This keeps
the memory footprint small, while still enabling CPU stall warnings
in kernels built to enable them.

Updated to include Josh Triplett's suggested use of RCU_STALL_COMMON
config variable to simplify #if expressions.

Reported-by: Thomas Gleixner <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Reviewed-by: Josh Triplett <[email protected]>
This commit is contained in:
Paul E. McKenney 2012-10-19 12:49:17 -07:00 • committed by Paul E. McKenney
commit 6bfc09e232
8 changed files with 130 additions and 51 deletions
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7
kernel/rcu.h
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@ -111,4 +111,11 @@ static inline bool __rcu_reclaim(char *rn, struct rcu_head *head)
extern int rcu_expedited;
#ifdef CONFIG_RCU_STALL_COMMON
extern int rcu_cpu_stall_suppress;
int rcu_jiffies_till_stall_check(void);
#endif /* #ifdef CONFIG_RCU_STALL_COMMON */
#endif /* __LINUX_RCU_H */