linux-kernel - [PATCH] perf: make pmu

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Message-Id: <20240204-bus_cleanup-events-v1-1-c779d1639c3a@marliere.net>
Date: Sun, 04 Feb 2024 10:29:39 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
 Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Mark Rutland <mark.rutland@....com>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
 Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>
Cc: linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH] perf: make pmu_bus const

Now that the driver core can properly handle constant struct bus_type,
move the pmu_bus variable to be a constant structure as well,
placing it into read-only memory which can not be modified at runtime.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@...liere.net>
---
 kernel/events/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 59b332cce9e7..decd994bfca4 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -11434,7 +11434,7 @@ static const struct attribute_group *pmu_dev_groups[] = {
 };

 static int pmu_bus_running;
-static struct bus_type pmu_bus = {
+static const struct bus_type pmu_bus = {
 	.name		= "event_source",
 	.dev_groups	= pmu_dev_groups,
 };

---
base-commit: fdd041028f2294228e10610b4fca6a1a83ac683d
change-id: 20240204-bus_cleanup-events-765165264090

Best regards,
-- 
Ricardo B. Marliere <ricardo@...liere.net>