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.pa...@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 9f58b3790baa..2bd3c418d769 100644
--- a/arch/riscv/mm/tlbflush.c
+++ b/arch/riscv/mm/tlbflush.c
@@ -21,6 +21,9 @@ static void __sbi_tlb_flush_range(struct cpumask *cmask,
unsigned long start,
goto issue_sfence;
}
+ if (cpumask_empty(cmask))
+ goto done;
+
if (cpumask_test_cpu(cpuid, cmask) && cpumask_weight(cmask) == 1) {
if (size <= PAGE_SIZE && size != -1)
local_flush_tlb_page(start);
--
2.21.0
