arm64: use shared sysctl constants

Use shared sysctl variables for zero and one constants, as in
commit eec4844f ("proc/sysctl: add shared variables for range check")

Fixes: 63f0c603 ("arm64: Introduce prctl() options to control the tagged user addresses ABI")
Signed-off-by: NMatteo Croce <mcroce@redhat.com>
Signed-off-by: NWill Deacon <will@kernel.org>

arch/arm64/kernel/process.c

@@ -608,8 +608,6 @@ long get_tagged_addr_ctrl(void)
  * only prevents the tagged address ABI enabling via prctl() and does not
  * disable it for tasks that already opted in to the relaxed ABI.
  */
-static int zero;
-static int one = 1;
 
 static struct ctl_table tagged_addr_sysctl_table[] = {
 	{
@@ -618,8 +616,8 @@ static struct ctl_table tagged_addr_sysctl_table[] = {
 		.data		= &tagged_addr_disabled,
 		.maxlen		= sizeof(int),
 		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= &zero,
-		.extra2		= &one,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_ONE,
 	},
 	{ }
 };