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rcu_sync: Cleanup the CONFIG_PROVE_RCU checks 

1. Rename __rcu_sync_is_idle() to rcu_sync_lockdep_assert() and
   change it to use rcu_lockdep_assert().

2. Change rcu_sync_is_idle() to return rsp->gp_state == GP_IDLE
   unconditonally, this way we can remove the same check from
   rcu_sync_lockdep_assert() and clearly isolate the debugging
   code.

Note: rcu_sync_enter()->wait_event(gp_state == GP_PASSED) needs
another CONFIG_PROVE_RCU check, the same as is done in ->sync(); but
this needs some simple preparations in the core RCU code to avoid the
code duplication.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Oleg Nesterov 2015-09-11 17:59:18 +02:00 committed by Paul E. McKenney
parent cc5f730b41
commit 4bace7344d
2 changed files with 6 additions and 7 deletions
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7
include/linux/rcu_sync.h
View File

@ -40,7 +40,7 @@ struct rcu_sync {
enum rcu_sync_type gp_type;
};
extern bool __rcu_sync_is_idle(struct rcu_sync *);
extern void rcu_sync_lockdep_assert(struct rcu_sync *);
/**
* rcu_sync_is_idle() - Are readers permitted to use their fastpaths?
@ -53,10 +53,9 @@ extern bool __rcu_sync_is_idle(struct rcu_sync *);
static inline bool rcu_sync_is_idle(struct rcu_sync *rsp)
{
#ifdef CONFIG_PROVE_RCU
return __rcu_sync_is_idle(rsp);
#else
return !rsp->gp_state; /* GP_IDLE */
rcu_sync_lockdep_assert(rsp);
#endif
return !rsp->gp_state; /* GP_IDLE */
}
extern void rcu_sync_init(struct rcu_sync *, enum rcu_sync_type);

6
kernel/rcu/sync.c
View File

@ -63,10 +63,10 @@ enum { CB_IDLE = 0, CB_PENDING, CB_REPLAY };
#define rss_lock gp_wait.lock
#ifdef CONFIG_PROVE_RCU
bool __rcu_sync_is_idle(struct rcu_sync *rsp)
void rcu_sync_lockdep_assert(struct rcu_sync *rsp)
{
WARN_ON(!gp_ops[rsp->gp_type].held());
return rsp->gp_state == GP_IDLE;
RCU_LOCKDEP_WARN(!gp_ops[rsp->gp_type].held(),
"suspicious rcu_sync_is_idle() usage");
}
#endif