[PATCH] firmware: memmap: Constify memmap_ktype

From: Kunwu Chan
Date: Mon Sep 23 2024 - 23:06:04 EST


This 'memmap_ktype' is not modified. It is only used in
firmware_map_add_entry().

Constifying this structure and moving it to a read-only section,
and this can increase over all security.

```
[Before]
text data bss dec hex filename
4345 596 12 4953 1359 drivers/firmware/memmap.o

[After]
text data bss dec hex filename
4393 548 12 4953 1359 drivers/firmware/memmap.o
```

Signed-off-by: Kunwu Chan <chentao@xxxxxxxxxx>
---
drivers/firmware/memmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/memmap.c b/drivers/firmware/memmap.c
index 8e59be3782cb..55b9cfad8a04 100644
--- a/drivers/firmware/memmap.c
+++ b/drivers/firmware/memmap.c
@@ -116,7 +116,7 @@ static void __meminit release_firmware_map_entry(struct kobject *kobj)
kfree(entry);
}

-static struct kobj_type __refdata memmap_ktype = {
+static const struct kobj_type memmap_ktype = {
.release = release_firmware_map_entry,
.sysfs_ops = &memmap_attr_ops,
.default_groups = def_groups,
--
2.41.0