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rcu, debug: detect stalled grace periods, cleanups 

small cleanups.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-08-11 13:34:15 +02:00
parent 67182ae1c4
commit 78635fc739
1 changed files with 13 additions and 13 deletions
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26
kernel/rcuclassic.c
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@ -294,6 +294,7 @@ static inline void record_gp_check_time(struct rcu_ctrlblk *rcp)
{ {
rcp->gp_check = get_seconds() + 3; rcp->gp_check = get_seconds() + 3;
} }
static void print_other_cpu_stall(struct rcu_ctrlblk *rcp) static void print_other_cpu_stall(struct rcu_ctrlblk *rcp)
{ {
int cpu; int cpu;
@ -303,11 +304,9 @@ static void print_other_cpu_stall(struct rcu_ctrlblk *rcp)
spin_lock(&rcp->lock); spin_lock(&rcp->lock);
delta = get_seconds() - rcp->gp_check; delta = get_seconds() - rcp->gp_check;
if (delta < 2L || if (delta < 2L || cpus_empty(rcp->cpumask)) {
cpus_empty(rcp->cpumask)) {
spin_unlock(&rcp->lock); spin_unlock(&rcp->lock);
return; return;
rcp->gp_check = get_seconds() + 30;
} }
spin_unlock(&rcp->lock); spin_unlock(&rcp->lock);
@ -319,6 +318,7 @@ static void print_other_cpu_stall(struct rcu_ctrlblk *rcp)
printk(" (detected by %d, t=%lu/%lu)\n", printk(" (detected by %d, t=%lu/%lu)\n",
smp_processor_id(), get_seconds(), rcp->gp_check); smp_processor_id(), get_seconds(), rcp->gp_check);
} }
static void print_cpu_stall(struct rcu_ctrlblk *rcp) static void print_cpu_stall(struct rcu_ctrlblk *rcp)
{ {
printk(KERN_ERR "RCU detected CPU %d stall (t=%lu/%lu)\n", printk(KERN_ERR "RCU detected CPU %d stall (t=%lu/%lu)\n",
@ -329,8 +329,8 @@ static void print_cpu_stall(struct rcu_ctrlblk *rcp)
rcp->gp_check = get_seconds() + 30; rcp->gp_check = get_seconds() + 30;
spin_unlock(&rcp->lock); spin_unlock(&rcp->lock);
} }
static inline void check_cpu_stall(struct rcu_ctrlblk *rcp,
struct rcu_data *rdp) static void check_cpu_stall(struct rcu_ctrlblk *rcp, struct rcu_data *rdp)
{ {
long delta; long delta;
@ -341,12 +341,11 @@ static inline void check_cpu_stall(struct rcu_ctrlblk *rcp,
print_cpu_stall(rcp); print_cpu_stall(rcp);
} else if (!cpus_empty(rcp->cpumask) && delta >= 2L) { } else {
if (!cpus_empty(rcp->cpumask) && delta >= 2L) {
/* They had two seconds to dump stack, so complain. */ /* They had two seconds to dump stack, so complain. */
print_other_cpu_stall(rcp);
print_other_cpu_stall(rcp); }
} }
} }
@ -355,8 +354,9 @@ static inline void check_cpu_stall(struct rcu_ctrlblk *rcp,
static inline void record_gp_check_time(struct rcu_ctrlblk *rcp) static inline void record_gp_check_time(struct rcu_ctrlblk *rcp)
{ {
} }
static inline void check_cpu_stall(struct rcu_ctrlblk *rcp,
struct rcu_data *rdp) static inline void
check_cpu_stall(struct rcu_ctrlblk *rcp, struct rcu_data *rdp)
{ {
} }