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sparc64: Add self-IPI support for smp_send_reschedule()

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CONFIG_NO_HZ_FULL requires possibility of smp_send_reschedule()
for the calling CPU. Currently, it is used in inc_nr_running()
scheduler primitive only.

Nobody calls smp_send_reschedule() from preemptible context
(furthermore, it looks like it will be save if anybody use it
another way in the future). But anyway I add WARN_ON() here
just to return here if anything changes.

Signed-off-by: Kirill Tkhai <tkhai@yandex.ru>
CC: David Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kirill Tkhai 2013-09-14 16:00:09 +04:00 committed by David S. Miller
parent 557fc5873e
commit 1a36265bf7
1 changed files with 7 additions and 2 deletions
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9
arch/sparc/kernel/smp_64.c
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@ -1399,8 +1399,13 @@ void __init smp_cpus_done(unsigned int max_cpus)
void smp_send_reschedule(int cpu) void smp_send_reschedule(int cpu)
{ {
xcall_deliver((u64) &xcall_receive_signal, 0, 0, if (cpu == smp_processor_id()) {
cpumask_of(cpu)); WARN_ON_ONCE(preemptible());
set_softint(1 << PIL_SMP_RECEIVE_SIGNAL);
} else {
xcall_deliver((u64) &xcall_receive_signal,
0, 0, cpumask_of(cpu));
}
} }
void __irq_entry smp_receive_signal_client(int irq, struct pt_regs *regs) void __irq_entry smp_receive_signal_client(int irq, struct pt_regs *regs)