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| author | Christoph Hellwig <hch@lst.de> | 2019-08-21 23:58:34 +0900 |
|---|---|---|
| committer | Paul Walmsley <paul.walmsley@sifive.com> | 2019-09-05 01:46:21 -0700 |
| commit | e11ea2a02b93933425ddfa4b4e2012ba0882ac82 (patch) | |
| tree | 762973ab56aef36b8383e4a5b7778de907e963f7 | |
| parent | 1db7a7ca5ac543d0e360d1e8a3dc10ce74b58027 (diff) | |
| download | linux-e11ea2a02b93933425ddfa4b4e2012ba0882ac82.tar.gz | |
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>
| -rw-r--r-- | arch/riscv/kernel/smp.c | 8 |
1 files changed, 7 insertions, 1 deletions
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) |