Commit e11ea2a0 authored Aug 21, 2019 by Christoph Hellwig Committed by Paul Walmsley Sep 05, 2019

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>

parent 1db7a7ca

arch/riscv/kernel/smp.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -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)

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