From 4d8121aa13fd14a5cb02ee200710b995971a0ad4 Mon Sep 17 00:00:00 2001 From: Jinyang He Date: Sat, 9 Dec 2023 15:49:15 +0800 Subject: [PATCH] LoongArch: Set unwind stack type to unknown rather than set error flag [ Upstream commit 97ceddbc9404a7d1e2c4049435bff29427d762cc ] During unwinding, unwind_done() is used as an end condition. Normally it unwind to the user stack and then set the stack type to unknown, which is a normal exit. When something unexpected happens in unwind process and we cannot unwind anymore, we should set the error flag, and also set the stack type to unknown to indicate that the unwind process can not continue. The error flag emphasizes that the unwind process produce an unexpected error. There is no unexpected things when we unwind the PT_REGS in the top of IRQ stack and find out that is an user mode PT_REGS. Thus, we should not set error flag and just set stack type to unknown. Reported-by: Hengqi Chen Acked-by: Hengqi Chen Signed-off-by: Jinyang He Signed-off-by: Huacai Chen Signed-off-by: Sasha Levin --- arch/loongarch/kernel/stacktrace.c | 2 +- arch/loongarch/kernel/unwind.c | 1 - arch/loongarch/kernel/unwind_prologue.c | 2 +- 3 files changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/loongarch/kernel/stacktrace.c b/arch/loongarch/kernel/stacktrace.c index 92270f1..f623feb 100644 --- a/arch/loongarch/kernel/stacktrace.c +++ b/arch/loongarch/kernel/stacktrace.c @@ -32,7 +32,7 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie, } for (unwind_start(&state, task, regs); - !unwind_done(&state) && !unwind_error(&state); unwind_next_frame(&state)) { + !unwind_done(&state); unwind_next_frame(&state)) { addr = unwind_get_return_address(&state); if (!addr || !consume_entry(cookie, addr)) break; diff --git a/arch/loongarch/kernel/unwind.c b/arch/loongarch/kernel/unwind.c index ba324ba..a463d69 100644 --- a/arch/loongarch/kernel/unwind.c +++ b/arch/loongarch/kernel/unwind.c @@ -28,6 +28,5 @@ bool default_next_frame(struct unwind_state *state) } while (!get_stack_info(state->sp, state->task, info)); - state->error = true; return false; } diff --git a/arch/loongarch/kernel/unwind_prologue.c b/arch/loongarch/kernel/unwind_prologue.c index 55afc27..929ae24 100644 --- a/arch/loongarch/kernel/unwind_prologue.c +++ b/arch/loongarch/kernel/unwind_prologue.c @@ -227,7 +227,7 @@ static bool next_frame(struct unwind_state *state) } while (!get_stack_info(state->sp, state->task, info)); out: - state->error = true; + state->stack_info.type = STACK_TYPE_UNKNOWN; return false; } -- 2.7.4