Merge: s390/entry: Mark IRQ entries to fix stack depot warnings

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/6221

JIRA: https://issues.redhat.com/browse/RHEL-74468

commits:
```
45c9f2b
```

Signed-off-by: Mete Durlu <mdurlu@redhat.com>

Approved-by: Steve Best <sbest@redhat.com>
Approved-by: Tony Camuso <tcamuso@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Rado Vrbovsky <rvrbovsk@redhat.com>

Author: emmil

arch/s390/kernel/entry.S

@@ -456,9 +456,13 @@ SYM_CODE_START(\name)
 SYM_CODE_END(\name)
 .endm
 
+	.section .irqentry.text, "ax"
+
 INT_HANDLER ext_int_handler,__LC_EXT_OLD_PSW,do_ext_irq
 INT_HANDLER io_int_handler,__LC_IO_OLD_PSW,do_io_irq
 
+	.section .kprobes.text, "ax"
+
 /*
  * Load idle PSW.
  */

arch/s390/kernel/kprobes.c

@@ -536,6 +536,12 @@ int __init arch_init_kprobes(void)
 	return 0;
 }
 
+int __init arch_populate_kprobe_blacklist(void)
+{
+	return kprobe_add_area_blacklist((unsigned long)__irqentry_text_start,
+					 (unsigned long)__irqentry_text_end);
+}
+
 int arch_trampoline_kprobe(struct kprobe *p)
 {
 	return 0;