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authorChristoph Hellwig <hch@lst.de>2019-08-21 23:58:34 +0900
committerPaul Walmsley <paul.walmsley@sifive.com>2019-09-05 01:46:21 -0700
commite11ea2a02b93933425ddfa4b4e2012ba0882ac82 (patch)
tree762973ab56aef36b8383e4a5b7778de907e963f7 /arch/riscv
parent1db7a7ca5ac543d0e360d1e8a3dc10ce74b58027 (diff)
downloadlinux-e11ea2a02b93933425ddfa4b4e2012ba0882ac82.tar.bz2
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>
Diffstat (limited to 'arch/riscv')
-rw-r--r--arch/riscv/kernel/smp.c8
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)