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| author | Kirill Tkhai <tkhai@yandex.ru> | 2013-09-14 14:00:09 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-11-14 23:56:50 +0100 |
| commit | 1a36265bf7d7e16b35fab5ae7f2f5d499bd0c14d (patch) | |
| tree | deed30adefe83b47a661230a9876f9370141c5e9 | |
| parent | sparc: PCI: Fix incorrect address calculation of PCI Bridge windows on Simba-... (diff) | |
| download | linux-1a36265bf7d7e16b35fab5ae7f2f5d499bd0c14d.tar.xz linux-1a36265bf7d7e16b35fab5ae7f2f5d499bd0c14d.zip | |
sparc64: Add self-IPI support for smp_send_reschedule()
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>
| -rw-r--r-- | arch/sparc/kernel/smp_64.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c index e142545244f2..b66a5338231e 100644 --- a/arch/sparc/kernel/smp_64.c +++ b/arch/sparc/kernel/smp_64.c @@ -1399,8 +1399,13 @@ void __init smp_cpus_done(unsigned int max_cpus) void smp_send_reschedule(int cpu) { - xcall_deliver((u64) &xcall_receive_signal, 0, 0, - cpumask_of(cpu)); + if (cpu == smp_processor_id()) { + 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) |