Commit 6384423f authored by Atish Patra's avatar Atish Patra Committed by Paul Walmsley
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RISC-V: Do not invoke SBI call if cpumask is empty 



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: default avatarAtish Patra <atish.patra@wdc.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarPaul Walmsley <paul.walmsley@sifive.com>
parent 00a5bf3a

arch/riscv/mm/tlbflush.c

+3 −0
Original line number Diff line number Diff line
@@ -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);

}