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rcu: Simplify rcu_report_dead() call to rcu_report_exp_rdp()

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Currently, rcu_report_dead() disables preemption across its call to
rcu_report_exp_rdp(), but this is pointless because interrupts are
already disabled by the caller.  In addition, rcu_report_dead() computes
the address of the outgoing CPU's rcu_data structure, which is also
pointless because this address is already present in local variable rdp.
This commit therefore drops the preemption disabling and passes rdp
to rcu_report_exp_rdp().

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-07-29 15:35:21 -07:00
parent 2caebefb00
commit 768f5d50e6
1 changed files with 1 additions and 3 deletions
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4
kernel/rcu/tree.c
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@ -4294,9 +4294,7 @@ void rcu_report_dead(unsigned int cpu)
do_nocb_deferred_wakeup(rdp);
/* QS for any half-done expedited grace period. */
preempt_disable();
rcu_report_exp_rdp(this_cpu_ptr(&rcu_data));
preempt_enable();
rcu_report_exp_rdp(rdp);
rcu_preempt_deferred_qs(current);
/* Remove outgoing CPU from mask in the leaf rcu_node structure. */