linux-kernel - [PATCH] sched: Export hidden tracepoints to modules

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Message-ID: <20250821082108.71339-1-gmonaco@redhat.com>
Date: Thu, 21 Aug 2025 10:21:08 +0200
From: Gabriele Monaco <gmonaco@...hat.com>
To: linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc: Gabriele Monaco <gmonaco@...hat.com>,
	Qais Yousef <qais.yousef@....com>,
	Phil Auld <pauld@...hat.com>,
	Vincent Donnefort <vincent.donnefort@....com>
Subject: [PATCH] sched: Export hidden tracepoints to modules

The tracepoints sched_entry, sched_exit and sched_set_need_resched
are not exported to tracefs as trace events, this allows only kernel
code to access them. Helper modules like [1] can be used to still have
the tracepoints available to ftrace for debugging purposes, but they do
rely on the tracepoints being exported.

Export the 3 not exported tracepoints.
Note that sched_set_state is already exported as the macro is called
from modules.

[1] - https://github.com/qais-yousef/sched_tp.git

Cc: Qais Yousef <qais.yousef@....com>
Cc: Phil Auld <pauld@...hat.com>
Cc: Vincent Donnefort <vincent.donnefort@....com>
Signed-off-by: Gabriele Monaco <gmonaco@...hat.com>
---
 kernel/sched/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index be00629f0ba4..d3321a5f69cc 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -117,6 +117,9 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(sched_util_est_cfs_tp);
 EXPORT_TRACEPOINT_SYMBOL_GPL(sched_util_est_se_tp);
 EXPORT_TRACEPOINT_SYMBOL_GPL(sched_update_nr_running_tp);
 EXPORT_TRACEPOINT_SYMBOL_GPL(sched_compute_energy_tp);
+EXPORT_TRACEPOINT_SYMBOL_GPL(sched_entry_tp);
+EXPORT_TRACEPOINT_SYMBOL_GPL(sched_exit_tp);
+EXPORT_TRACEPOINT_SYMBOL_GPL(sched_set_need_resched_tp);
 
 DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
 

base-commit: c17b750b3ad9f45f2b6f7e6f7f4679844244f0b9
-- 
2.50.1