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xen: balloon: make balloon_subsys const

Now that the driver core can properly handle constant struct bus_type,
move the balloon_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@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20240203-bus_cleanup-xen-v1-2-c2f5fe89ed95@marliere.net
Signed-off-by: Juergen Gross <jgross@suse.com>

authored by

Ricardo B. Marliere and committed by
Juergen Gross b0f2f82c 2528dcbe

+1 -1
+1 -1
drivers/xen/xen-balloon.c
··· 237 237 NULL 238 238 }; 239 239 240 - static struct bus_type balloon_subsys = { 240 + static const struct bus_type balloon_subsys = { 241 241 .name = BALLOON_CLASS_NAME, 242 242 .dev_name = BALLOON_CLASS_NAME, 243 243 };