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rcu: Expand SRCU ->completed to 64 bits 

When rcutorture used only the low-order 32 bits of the grace-period
number, it was not a problem for SRCU to use a 32-bit completed field.
However, rcutorture now uses the full 64 bits on 64-bit systems, so
this commit converts SRCU's ->completed field to unsigned long so as to
provide 64 bits on 64-bit systems.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2014-11-23 20:30:06 -08:00
parent 734d168013
commit a5c198f4f7
2 changed files with 3 additions and 3 deletions
include/linux
srcu.h
kernel/rcu
srcu.c

4
include/linux/srcu.h
View File

@ -45,7 +45,7 @@ struct rcu_batch {
#define RCU_BATCH_INIT(name) { NULL, &(name.head) } #define RCU_BATCH_INIT(name) { NULL, &(name.head) }
struct srcu_struct { struct srcu_struct {
unsigned completed; unsigned long completed;
struct srcu_struct_array __percpu *per_cpu_ref; struct srcu_struct_array __percpu *per_cpu_ref;
spinlock_t queue_lock; /* protect ->batch_queue, ->running */ spinlock_t queue_lock; /* protect ->batch_queue, ->running */
bool running; bool running;
@ -135,7 +135,7 @@ int __srcu_read_lock(struct srcu_struct *sp) __acquires(sp);
void __srcu_read_unlock(struct srcu_struct *sp, int idx) __releases(sp); void __srcu_read_unlock(struct srcu_struct *sp, int idx) __releases(sp);
void synchronize_srcu(struct srcu_struct *sp); void synchronize_srcu(struct srcu_struct *sp);
void synchronize_srcu_expedited(struct srcu_struct *sp); void synchronize_srcu_expedited(struct srcu_struct *sp);
long srcu_batches_completed(struct srcu_struct *sp); unsigned long srcu_batches_completed(struct srcu_struct *sp);
void srcu_barrier(struct srcu_struct *sp); void srcu_barrier(struct srcu_struct *sp);
#ifdef CONFIG_DEBUG_LOCK_ALLOC #ifdef CONFIG_DEBUG_LOCK_ALLOC

2
kernel/rcu/srcu.c
View File

@ -546,7 +546,7 @@ EXPORT_SYMBOL_GPL(srcu_barrier);
* Report the number of batches, correlated with, but not necessarily * Report the number of batches, correlated with, but not necessarily
* precisely the same as, the number of grace periods that have elapsed. * precisely the same as, the number of grace periods that have elapsed.
*/ */
long srcu_batches_completed(struct srcu_struct *sp) unsigned long srcu_batches_completed(struct srcu_struct *sp)
{ {
return sp->completed; return sp->completed;
} }