Messages in this thread Patch in this message | | | From | Atish Patra <> | Subject | [PATCH v4 1/3] RISC-V: Do not invoke SBI call if cpumask is empty | Date | Thu, 22 Aug 2019 00:51:49 -0700 |
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SBI calls are expensive. If cpumask is empty, there is no need to trap via SBI as no remote tlb flushing is required.
Signed-off-by: Atish Patra <atish.patra@wdc.com> --- arch/riscv/mm/tlbflush.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c index df93b26f1b9d..1293b8017ee0 100644 --- a/arch/riscv/mm/tlbflush.c +++ b/arch/riscv/mm/tlbflush.c @@ -14,6 +14,9 @@ static void __sbi_tlb_flush_range(struct cpumask *cmask, unsigned long start, { struct cpumask hmask; + if (cpumask_empty(cmask)) + return; + riscv_cpuid_to_hartid_mask(cmask, &hmask); sbi_remote_sfence_vma(hmask.bits, start, size); } -- 2.21.0
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