linux-kernel - [PATCH] memory tier: make memory_tier

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Message-Id: <20240204-bus_cleanup-mm-v1-1-00f49286f164@marliere.net>
Date: Sun, 04 Feb 2024 10:56:44 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH] memory tier: make memory_tier_subsys const

Now that the driver core can properly handle constant struct bus_type,
move the memory_tier_subsys 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>
---
 mm/memory-tiers.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c
index 5462d9e3c84c..ed20f96bf89d 100644
--- a/mm/memory-tiers.c
+++ b/mm/memory-tiers.c
@@ -39,7 +39,7 @@ static LIST_HEAD(memory_tiers);
 static struct node_memory_type_map node_memory_types[MAX_NUMNODES];
 struct memory_dev_type *default_dram_type;

-static struct bus_type memory_tier_subsys = {
+static const struct bus_type memory_tier_subsys = {
 	.name = "memory_tiering",
 	.dev_name = "memory_tier",
 };

---
base-commit: 91f3daa1765ee4e0c89987dc25f72c40f07af34d
change-id: 20240204-bus_cleanup-mm-d8c2937d6af4

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