x86/apic: Mark acpi_mp_wake_* variables as __ro_after_init

acpi_mp_wake_mailbox_paddr and acpi_mp_wake_mailbox are initialized once during
ACPI MADT init and never changed.

Signed-off-by: Kirill A. Shutemov <[email protected]>
Signed-off-by: Borislav Petkov (AMD) <[email protected]>
Reviewed-by: Baoquan He <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
Acked-by: Kai Huang <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>
Tested-by: Tao Liu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: kiryl

arch/x86/kernel/acpi/madt_wakeup.c

@@ -6,10 +6,10 @@
 #include <asm/processor.h>
 
 /* Physical address of the Multiprocessor Wakeup Structure mailbox */
-static u64 acpi_mp_wake_mailbox_paddr;
+static u64 acpi_mp_wake_mailbox_paddr __ro_after_init;
 
 /* Virtual address of the Multiprocessor Wakeup Structure mailbox */
-static struct acpi_madt_multiproc_wakeup_mailbox *acpi_mp_wake_mailbox;
+static struct acpi_madt_multiproc_wakeup_mailbox *acpi_mp_wake_mailbox __ro_after_init;
 
 static int acpi_wakeup_cpu(u32 apicid, unsigned long start_ip)
 {