Commit 16718274 authored Jan 26, 2026 by Steven Rostedt Committed by Steven Rostedt (Google) Jan 30, 2026

tracing: perf: Have perf tracepoint callbacks always disable preemption

In preparation to convert protection of tracepoints from being protected
by a preempt disabled section to being protected by SRCU, have all the
perf callbacks disable preemption as perf expects preemption to be
disabled when processing tracepoints.

While at it, convert the perf system call callback preempt_disable() to a
guard(preempt).

Link: https://lore.kernel.org/all/20250613152218.1924093-1-bigeasy@linutronix.de/
Link: https://patch.msgid.link/20260108220550.2f6638f3@fedora

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Alexei Starovoitov <ast@kernel.org>
Link: https://patch.msgid.link/20260126231256.174621257@kernel.org


Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

parent 84c2344b

include/trace/perf.h

+2 −2

Original line number	Diff line number	Diff line
		@@ -71,6 +71,7 @@ perf_trace_##call(void *__data, proto) \
		u64 __count __attribute__((unused)); \
		struct task_struct *__task __attribute__((unused)); \
		\
		guard(preempt_notrace)(); \
		do_perf_trace_##call(__data, args); \
		}

		@@ -85,9 +86,8 @@ perf_trace_##call(void *__data, proto) \
		struct task_struct *__task __attribute__((unused)); \
		\
		might_fault(); \
		preempt_disable_notrace(); \
		guard(preempt_notrace)(); \
		do_perf_trace_##call(__data, args); \
		preempt_enable_notrace(); \
		}

		/*