diff options
| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2016-08-19 13:53:02 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-08-24 12:15:15 +0200 |
| commit | 13e25bab7e51bdd4ba7df1ef2388961294bb565e (patch) | |
| tree | df72396b023d528a32f481617bd118be64ac1075 | |
| parent | x86/dumpstack/ftrace: Mark function graph handler function as unreliable (diff) | |
| download | linux-13e25bab7e51bdd4ba7df1ef2388961294bb565e.tar.xz linux-13e25bab7e51bdd4ba7df1ef2388961294bb565e.zip | |
x86/dumpstack/ftrace: Don't print unreliable addresses in print_context_stack_bp()
When function graph tracing is enabled, print_context_stack_bp() can
report return_to_handler() as an unreliable address, which is confusing
and misleading: return_to_handler() is really only useful as a hint for
debugging, whereas print_context_stack_bp() users only care about the
actual 'reliable' call path.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Byungchul Park <byungchul.park@lge.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/c51aef578d8027791b38d2ad9bac0c7f499fde91.1471607358.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | arch/x86/kernel/dumpstack.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c index 6aad8d4e2ea6..01072e9e165e 100644 --- a/arch/x86/kernel/dumpstack.c +++ b/arch/x86/kernel/dumpstack.c @@ -126,8 +126,6 @@ print_context_stack_bp(struct task_struct *task, break; real_addr = ftrace_graph_ret_addr(task, graph, addr, retp); - if (real_addr != addr && ops->address(data, addr, 0)) - break; if (ops->address(data, real_addr, 1)) break; |