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Diffstat (limited to 'arch/riscv/mm/tlbflush.c')
-rw-r--r--arch/riscv/mm/tlbflush.c25
1 files changed, 23 insertions, 2 deletions
diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c
index 24cd33d2c48f..720b443c4528 100644
--- a/arch/riscv/mm/tlbflush.c
+++ b/arch/riscv/mm/tlbflush.c
@@ -2,6 +2,7 @@
#include <linux/mm.h>
#include <linux/smp.h>
+#include <linux/sched.h>
#include <asm/sbi.h>
void flush_tlb_all(void)
@@ -9,13 +10,33 @@ void flush_tlb_all(void)
sbi_remote_sfence_vma(NULL, 0, -1);
}
+/*
+ * This function must not be called with cmask being null.
+ * Kernel may panic if cmask is NULL.
+ */
static void __sbi_tlb_flush_range(struct cpumask *cmask, unsigned long start,
unsigned long size)
{
struct cpumask hmask;
+ unsigned int cpuid;
- riscv_cpuid_to_hartid_mask(cmask, &hmask);
- sbi_remote_sfence_vma(hmask.bits, start, size);
+ if (cpumask_empty(cmask))
+ return;
+
+ cpuid = get_cpu();
+
+ if (cpumask_any_but(cmask, cpuid) >= nr_cpu_ids) {
+ /* local cpu is the only cpu present in cpumask */
+ if (size <= PAGE_SIZE)
+ local_flush_tlb_page(start);
+ else
+ local_flush_tlb_all();
+ } else {
+ riscv_cpuid_to_hartid_mask(cmask, &hmask);
+ sbi_remote_sfence_vma(cpumask_bits(&hmask), start, size);
+ }
+
+ put_cpu();
}
void flush_tlb_mm(struct mm_struct *mm)