linux-kernel - [PATCH 3/7] riscv: kprobes: Use patch_text

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Date: Sun, 11 Feb 2024 18:55:14 -0800
From: Samuel Holland <samuel.holland@...ive.com>
To: Palmer Dabbelt <palmer@...belt.com>
Cc: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Samuel Holland <samuel.holland@...ive.com>
Subject: [PATCH 3/7] riscv: kprobes: Use patch_text_nosync() for insn slots

These instructions are not yet visible to the rest of the system,
so there is no need to do the whole stop_machine() dance.

Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
---

 arch/riscv/kernel/probes/kprobes.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/kernel/probes/kprobes.c b/arch/riscv/kernel/probes/kprobes.c
index 2f08c14a933d..cbf8197072bf 100644
--- a/arch/riscv/kernel/probes/kprobes.c
+++ b/arch/riscv/kernel/probes/kprobes.c
@@ -28,9 +28,9 @@ 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, 1);
-	patch_text((void *)((unsigned long)(p->ainsn.api.insn) + offset),
-		   &insn, 1);
+	patch_text_nosync(p->ainsn.api.insn, &p->opcode, 1);
+	patch_text_nosync(p->ainsn.api.insn + offset,
+			  &insn, 1);
 }
 
 static void __kprobes arch_prepare_simulate(struct kprobe *p)
-- 
2.43.0