Commit 13e25bab authored by Josh Poimboeuf's avatar Josh Poimboeuf Committed by Ingo Molnar

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: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
Acked-by: default avatarSteven 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.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 6f727b84
...@@ -126,8 +126,6 @@ print_context_stack_bp(struct task_struct *task, ...@@ -126,8 +126,6 @@ print_context_stack_bp(struct task_struct *task,
break; break;
real_addr = ftrace_graph_ret_addr(task, graph, addr, retp); 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)) if (ops->address(data, real_addr, 1))
break; break;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment