s390/mm: Remove have_store_indication static key

Whenever test_facility() is used with a constant facility
number the generated code is identical to a static branch.

Remove the extra initcall and static_branch_enable() handling for
have_store_indication, and use test_facility() directly.

Acked-by: Alexander Gordeev <[e-mail]>
Signed-off-by: Heiko Carstens <[e-mail]>
Signed-off-by: Vasily Gorbik <[e-mail]>

arch/s390/mm/fault.c

···
 #include <linux/signal.h>
 #include <linux/sched.h>
 #include <linux/sched/debug.h>
-#include <linux/jump_label.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/string.h>
···
 #include <asm/uv.h>
 #include "../kernel/entry.h"
 
-static DEFINE_STATIC_KEY_FALSE(have_store_indication);
-
-static int __init fault_init(void)
-{
-	if (test_facility(75))
-		static_branch_enable(&have_store_indication);
-	return 0;
-}
-early_initcall(fault_init);
-
 /*
  * Find out which address space caused the exception.
  */
···
 {
 	union teid teid = { .val = regs->int_parm_long };
 
-	if (static_branch_likely(&have_store_indication))
+	if (test_facility(75))
 		return teid.fsi == TEID_FSI_STORE;
 	return false;
 }