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rcu: Eliminate check_for_new_grace_period() wrapper function 

One of the calls to check_for_new_grace_period() is now redundant due to
an immediately preceding call to note_gp_changes().  Eliminating this
redundant call leaves a single caller, which is simpler if inlined.
This commit therefore eliminates the redundant call and inlines the
body of check_for_new_grace_period() into the single remaining call site.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2013-03-19 12:21:29 -07:00
parent ba9fbe955f
commit 63274cfb94
1 changed files with 3 additions and 22 deletions
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25
kernel/rcutree.c
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@ -1307,26 +1307,6 @@ static void note_gp_changes(struct rcu_state *rsp, struct rcu_data *rdp)
raw_spin_unlock_irqrestore(&rnp->lock, flags);
}
/*
* Did someone else start a new RCU grace period start since we last
* checked? Update local state appropriately if so. Must be called
* on the CPU corresponding to rdp.
*/
static int
check_for_new_grace_period(struct rcu_state *rsp, struct rcu_data *rdp)
{
unsigned long flags;
int ret = 0;
local_irq_save(flags);
if (rdp->gpnum != rsp->gpnum) {
note_gp_changes(rsp, rdp);
ret = 1;
}
local_irq_restore(flags);
return ret;
}
/*
* Do per-CPU grace-period initialization for running CPU. The caller
* must hold the lock of the leaf rcu_node structure corresponding to
@ -1749,8 +1729,10 @@ static void
rcu_check_quiescent_state(struct rcu_state *rsp, struct rcu_data *rdp)
{
/* If there is now a new grace period, record and return. */
if (check_for_new_grace_period(rsp, rdp))
if (rdp->gpnum != rsp->gpnum) {
note_gp_changes(rsp, rdp);
return;
}
/*
* Does this CPU still need to do its part for current grace period?
@ -2302,7 +2284,6 @@ static void __call_rcu_core(struct rcu_state *rsp, struct rcu_data *rdp,
/* Are we ignoring a completed grace period? */
note_gp_changes(rsp, rdp);
check_for_new_grace_period(rsp, rdp);
/* Start a new grace period if one not already started. */
if (!rcu_gp_in_progress(rsp)) {