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| author | Sebastian Andrzej Siewior <[email protected]> | 2025-02-20 14:07:49 +0000 |
|---|---|---|
| committer | Steven Rostedt (Google) <[email protected]> | 2025-02-21 14:36:12 +0000 |
| commit | 57b76bedc5c52c66968183b5ef57234894c25ce7 (patch) | |
| tree | d9a64ff1d2cad69b3a69757baf17493ea9518cf1 /net/unix/garbage.c | |
| parent | selftests/ftrace: Update fprobe test to check enabled_functions file (diff) | |
| download | kernel-57b76bedc5c52c66968183b5ef57234894c25ce7.tar.gz kernel-57b76bedc5c52c66968183b5ef57234894c25ce7.zip | |
ftrace: Correct preemption accounting for function tracing.
The function tracer should record the preemption level at the point when
the function is invoked. If the tracing subsystem decrement the
preemption counter it needs to correct this before feeding the data into
the trace buffer. This was broken in the commit cited below while
shifting the preempt-disabled section.
Use tracing_gen_ctx_dec() which properly subtracts one from the
preemption counter on a preemptible kernel.
Cc: [email protected]
Cc: Wander Lairson Costa <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: https://lore.kernel.org/[email protected]
Fixes: ce5e48036c9e7 ("ftrace: disable preemption when recursion locked")
Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Tested-by: Wander Lairson Costa <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>
Diffstat (limited to 'net/unix/garbage.c')
0 files changed, 0 insertions, 0 deletions