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riscv: optimize send_ipi_single 

Don't go through send_ipi_mask, but just set the op bit and then pass
a simple generated hartid mask directly to sbi_send_ipi.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
[paul.walmsley@sifive.com: minor patch description fixes]
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
This commit is contained in:
Christoph Hellwig 2019-08-21 23:58:34 +09:00 committed by Paul Walmsley
parent 1db7a7ca5a
commit e11ea2a02b
1 changed files with 7 additions and 1 deletions
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8
arch/riscv/kernel/smp.c
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@ -94,7 +94,13 @@ static void send_ipi_mask(const struct cpumask *mask, enum ipi_message_type op)
static void send_ipi_single(int cpu, enum ipi_message_type op)
{
send_ipi_mask(cpumask_of(cpu), op);
int hartid = cpuid_to_hartid_map(cpu);
smp_mb__before_atomic();
set_bit(op, &ipi_data[cpu].bits);
smp_mb__after_atomic();
sbi_send_ipi(cpumask_bits(cpumask_of(hartid)));
}
static inline void clear_ipi(void)