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[2/3] csky/kprobe: Optimize the performance of patching single-step slot

Message ID 20220927022435.129965-3-liaochang1@huawei.com (mailing list archive)
State New, archived
Headers show
Series kprobe: Optimize the performance of patching ss | expand

Commit Message

Liao, Chang Sept. 27, 2022, 2:24 a.m. UTC 
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.

Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Liao Chang <liaochang1@huawei.com>
---
 arch/csky/kernel/probes/kprobes.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
diff mbox series

Patch

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)