[PATCH V2 2/3] csky/kprobe: Optimize the performance of patching single-step slot
Liao Chang
liaochang1 at huawei.com
Mon Sep 12 20:34:53 PDT 2022
Single-step slot would not be used until kprobe is enabled, that means
no race condition occurs on it under SMP, hence it is safe to pacth ss
slot without stopping machine.
Signed-off-by: Liao Chang <liaochang1 at huawei.com>
---
arch/csky/kernel/probes/kprobes.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/csky/kernel/probes/kprobes.c b/arch/csky/kernel/probes/kprobes.c
index 3c6e5c725d81..4feb5ce16264 100644
--- a/arch/csky/kernel/probes/kprobes.c
+++ b/arch/csky/kernel/probes/kprobes.c
@@ -57,7 +57,11 @@ static void __kprobes arch_prepare_ss_slot(struct kprobe *p)
p->ainsn.api.restore = (unsigned long)p->addr + offset;
- patch_text(p->ainsn.api.insn, p->opcode);
+ memcpy(p->ainsn.api.insn, &p->opcode, offset);
+ dcache_wb_range((unsigned long)p->ainsn.api.insn,
+ (unsigned long)p->ainsn.api.insn + offset);
+ icache_inv_range((unsigned long)p->ainsn.api.insn,
+ (unsigned long)p->ainsn.api.insn + offset);
}
static void __kprobes arch_prepare_simulate(struct kprobe *p)
--
2.17.1
More information about the linux-riscv
mailing list