From 79c338ab575e16f8e5195d76cb81638fddaf6a55 Mon Sep 17 00:00:00 2001 From: Jisheng Zhang Date: Tue, 30 Mar 2021 02:16:24 +0800 Subject: [PATCH] riscv: keep interrupts disabled for BREAKPOINT exception Current riscv's kprobe handlers are run with both preemption and interrupt enabled, this violates kprobe requirements. Fix this issue by keeping interrupts disabled for BREAKPOINT exception. Fixes: c22b0bcb1dd0 ("riscv: Add kprobes supported") Signed-off-by: Jisheng Zhang Reviewed-by: Masami Hiramatsu [Palmer: add a comment] Signed-off-by: Palmer Dabbelt --- arch/riscv/kernel/entry.S | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S index 76274a4a1d8e..83095faa680e 100644 --- a/arch/riscv/kernel/entry.S +++ b/arch/riscv/kernel/entry.S @@ -130,6 +130,9 @@ skip_context_tracking: */ andi t0, s1, SR_PIE beqz t0, 1f + /* kprobes, entered via ebreak, must have interrupts disabled. */ + li t0, EXC_BREAKPOINT + beq s4, t0, 1f #ifdef CONFIG_TRACE_IRQFLAGS call trace_hardirqs_on #endif -- 2.50.1