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rcu/tree: Remove CONFIG_PREMPT_RCU check in force_qs_rnp()
Originally, the call to rcu_preempt_blocked_readers_cgp() from
force_qs_rnp() had to be conditioned on CONFIG_PREEMPT_RCU=y, as in
commit a77da14ce9
("rcu: Yet another fix for preemption and CPU
hotplug"). However, there is now a CONFIG_PREEMPT_RCU=n definition of
rcu_preempt_blocked_readers_cgp() that unconditionally returns zero, so
invoking it is now safe. In addition, the CONFIG_PREEMPT_RCU=n definition
of rcu_initiate_boost() simply releases the rcu_node structure's ->lock,
which is what happens when the "if" condition evaluates to false.
This commit therefore drops the IS_ENABLED(CONFIG_PREEMPT_RCU) check,
so that rcu_initiate_boost() is called only in CONFIG_PREEMPT_RCU=y
kernels when there are readers blocking the current grace period.
This does not change the behavior, but reduces code-reader confusion by
eliminating non-CONFIG_PREEMPT_RCU=y calls to rcu_initiate_boost().
Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
parent
9c39245382
commit
9b1ce0acb5
1 changed files with 1 additions and 2 deletions
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@ -2533,8 +2533,7 @@ static void force_qs_rnp(int (*f)(struct rcu_data *rdp))
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raw_spin_lock_irqsave_rcu_node(rnp, flags);
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rcu_state.cbovldnext |= !!rnp->cbovldmask;
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if (rnp->qsmask == 0) {
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if (!IS_ENABLED(CONFIG_PREEMPT_RCU) ||
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rcu_preempt_blocked_readers_cgp(rnp)) {
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if (rcu_preempt_blocked_readers_cgp(rnp)) {
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/*
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* No point in scanning bits because they
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* are all zero. But we might need to
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