linux-kernel - [PATCH v2] cxl: make cxl_bus

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Message-ID: <2025070138-vigorous-negative-eae7@gregkh>
Date: Tue,  1 Jul 2025 14:07:39 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	Jonathan Cameron <jonathan.cameron@...wei.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Alison Schofield <alison.schofield@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Ira Weiny <ira.weiny@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-cxl@...r.kernel.org
Subject: [PATCH v2] cxl: make cxl_bus_type constant

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

Cc: Davidlohr Bueso <dave@...olabs.net>
Cc: Jonathan Cameron <jonathan.cameron@...wei.com>
Cc: Dave Jiang <dave.jiang@...el.com>
Cc: Alison Schofield <alison.schofield@...el.com>
Cc: Vishal Verma <vishal.l.verma@...el.com>
Cc: Ira Weiny <ira.weiny@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: linux-cxl@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
v2: fix up the subject line to be correct

 drivers/cxl/core/port.c | 2 +-
 drivers/cxl/cxl.h       | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index eb46c6764d20..0696f7fcef56 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -2293,7 +2293,7 @@ static const struct attribute_group *cxl_bus_attribute_groups[] = {
 	NULL,
 };
 
-struct bus_type cxl_bus_type = {
+const struct bus_type cxl_bus_type = {
 	.name = "cxl",
 	.uevent = cxl_bus_uevent,
 	.match = cxl_bus_match,
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index 3f1695c96abc..e7b66ca1d423 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -815,7 +815,7 @@ int cxl_dvsec_rr_decode(struct cxl_dev_state *cxlds,
 
 bool is_cxl_region(struct device *dev);
 
-extern struct bus_type cxl_bus_type;
+extern const struct bus_type cxl_bus_type;
 
 struct cxl_driver {
 	const char *name;
-- 
2.50.0