diff options
| author | Tatsuya S <tatsuya.s2862@gmail.com> | 2024-05-28 12:24:14 +0900 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2024-06-06 15:22:18 -0400 |
| commit | 6c1f7f0acabd35ad73525bd2766da4669c18a9e6 (patch) | |
| tree | 708a95ba910f2949fe9ef21765a6dd4632a5a130 /kernel/trace | |
| parent | 4057fd2cddaea0d6f6c5f8af4a455741f5632259 (diff) | |
ftrace: Hide one more entry in stack trace when ftrace_pid is enabled
On setting set_ftrace_pid, a extra entry generated by ftrace_pid_func()
is shown on stack trace(CONFIG_UNWINDER_FRAME_POINTER=y).
[004] ..... 68.459382: <stack trace>
=> 0xffffffffa00090af
=> ksys_read
=> __x64_sys_read
=> x64_sys_call
=> do_syscall_64
=> entry_SYSCALL_64_after_hwframe
To resolve this issue, increment skip count
in function_stack_trace_call() if pids are set.
Link: https://lore.kernel.org/linux-trace-kernel/20240528032604.6813-3-tatsuya.s2862@gmail.com
Signed-off-by: Tatsuya S <tatsuya.s2862@gmail.com>
[ Rebased to current tree ]
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace_functions.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c index 13bf2415245d..3b0cea37e029 100644 --- a/kernel/trace/trace_functions.c +++ b/kernel/trace/trace_functions.c @@ -231,6 +231,7 @@ function_stack_trace_call(unsigned long ip, unsigned long parent_ip, long disabled; int cpu; unsigned int trace_ctx; + int skip = STACK_SKIP; if (unlikely(!tr->function_enabled)) return; @@ -247,7 +248,11 @@ function_stack_trace_call(unsigned long ip, unsigned long parent_ip, if (likely(disabled == 1)) { trace_ctx = tracing_gen_ctx_flags(flags); trace_function(tr, ip, parent_ip, trace_ctx); - __trace_stack(tr, trace_ctx, STACK_SKIP); +#ifdef CONFIG_UNWINDER_FRAME_POINTER + if (ftrace_pids_enabled(op)) + skip++; +#endif + __trace_stack(tr, trace_ctx, skip); } atomic_dec(&data->disabled); |