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ftrace: Add more information to ftrace_bug() output

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With the introduction of the dynamic trampolines, it is useful that if
things go wrong that ftrace_bug() produces more information about what
the current state is. This can help debug issues that may arise.

Ftrace has lots of checks to make sure that the state of the system it
touchs is exactly what it expects it to be. When it detects an abnormality
it calls ftrace_bug() and disables itself to prevent any further damage.
It is crucial that ftrace_bug() produces sufficient information that
can be used to debug the situation.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Borislav Petkov <bp@suse.de>
Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat)
2014-10-24 17:56:04 -04:00
committed by Steven Rostedt
parent 12cce594fa
commit 4fd3279b48
4 changed files with 34 additions and 12 deletions
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4
include/linux/ftrace.h
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@@ -263,7 +263,9 @@ struct ftrace_func_command {
int ftrace_arch_code_modify_prepare(void);
int ftrace_arch_code_modify_post_process(void);
void ftrace_bug(int err, unsigned long ip);
struct dyn_ftrace;
void ftrace_bug(int err, struct dyn_ftrace *rec);
struct seq_file;