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ftrace/x86: Add back ftrace_expected for ftrace bug reports
After someone reported a bug report with a failed modification due to the
expected value not matching what was found, it came to my attention that
the ftrace_expected is no longer set when that happens. This makes for
debugging the issue a bit more difficult.
Set ftrace_expected to the expected code before calling ftrace_bug, so
that it shows what was expected and why it failed.
Link: https://lore.kernel.org/all/CA+wXwBQ-VhK+hpBtYtyZP-NiX4g8fqRRWithFOHQW-0coQ3vLg@mail.gmail.com/
Link: https://lore.kernel.org/linux-trace-kernel/20221209105247.01d4e51d@gandalf.local.home
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "x86@kernel.org" <x86@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: stable@vger.kernel.org
Fixes: 768ae4406a
("x86/ftrace: Use text_poke()")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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1 changed files with 2 additions and 0 deletions
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@ -217,7 +217,9 @@ void ftrace_replace_code(int enable)
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ret = ftrace_verify_code(rec->ip, old);
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if (ret) {
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ftrace_expected = old;
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ftrace_bug(ret, rec);
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ftrace_expected = NULL;
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return;
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}
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}
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