block, bfq: constify sysfs attributes

The elevator core now allows instances of 'struct elv_fs_entry' to be
moved into read-only memory. Make use of that to protect them against
accidental or malicious modifications.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20250102-sysfs-const-attr-elevator-v1-3-9837d2058c60@weissschuh.net
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 95dd7b795935658b8709de7eab81b4730ece022d..068c63e957382e41de2454efabbab50b06d1ffd2 100644 (file)
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -7614,7 +7614,7 @@ static ssize_t bfq_low_latency_store(struct elevator_queue *e,
 #define BFQ_ATTR(name) \
        __ATTR(name, 0644, bfq_##name##_show, bfq_##name##_store)
 
-static struct elv_fs_entry bfq_attrs[] = {
+static const struct elv_fs_entry bfq_attrs[] = {
        BFQ_ATTR(fifo_expire_sync),
        BFQ_ATTR(fifo_expire_async),
        BFQ_ATTR(back_seek_max),