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block: make block_class constant

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Since commit 43a7206b09 ("driver core: class: make class_register() take
a const *"), the driver core allows for struct class to be in read-only
memory, so move the block_class structure to be declared at build time
placing it into read-only memory, instead of having to be dynamically
allocated at boot time.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240305-class_cleanup-block-v1-1-130bb27b9c72@marliere.net
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ricardo B. Marliere 2024-03-05 16:32:16 -03:00 committed by Jens Axboe
parent 33bffbb727
commit f8c7511db0
3 changed files with 3 additions and 3 deletions
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2
block/genhd.c
View File

@ -1201,7 +1201,7 @@ static int block_uevent(const struct device *dev, struct kobj_uevent_env *env)
return add_uevent_var(env, "DISKSEQ=%llu", disk->diskseq);
}
struct class block_class = {
const struct class block_class = {
.name = "block",
.dev_uevent = block_uevent,
};

2
drivers/base/base.h
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@ -207,7 +207,7 @@ static inline int devtmpfs_init(void) { return 0; }
#endif
#ifdef CONFIG_BLOCK
extern struct class block_class;
extern const struct class block_class;
static inline bool is_blockdev(struct device *dev)
{
return dev->class == &block_class;

2
include/linux/blkdev.h
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@ -42,7 +42,7 @@ struct blk_crypto_profile;
extern const struct device_type disk_type;
extern const struct device_type part_type;
extern struct class block_class;
extern const struct class block_class;
/*
* Maximum number of blkcg policies allowed to be registered concurrently.