From e11ea2a02b93933425ddfa4b4e2012ba0882ac82 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 21 Aug 2019 23:58:34 +0900 Subject: 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 Reviewed-by: Atish Patra [paul.walmsley@sifive.com: minor patch description fixes] Signed-off-by: Paul Walmsley --- arch/riscv/kernel/smp.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'arch/riscv') diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c index 2e21669aa068..a3715d621f60 100644 --- a/arch/riscv/kernel/smp.c +++ b/arch/riscv/kernel/smp.c @@ -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) -- cgit v1.2.3