printk: enable zap_locks on X86 and ARM64

hulk inclusion
category: bugfix
bugzilla: 34546, https://gitee.com/openeuler/kernel/issues/I4JKT1
CVE: NA

----------------------------------------

Any architecture that involves an NMI should be treated with caution.
For example, the X86 architecture and ARM64 enabled PSEUDO NMI.
Signed-off-by: NCheng Jian <cj.chengjian@huawei.com>
Reviewed-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

include/linux/printk.h

@@ -209,8 +209,12 @@ void show_regs_print_info(const char *log_lvl);
 extern asmlinkage void dump_stack(void) __cold;
 extern void printk_safe_flush(void);
 extern void printk_safe_flush_on_panic(void);
+#if defined(CONFIG_X86) || defined(CONFIG_ARM64_PSEUDO_NMI)
 extern void zap_locks(void);
 #else
+static inline void zap_locks(void) { }
+#endif
+#else
 static inline __printf(1, 0)
 int vprintk(const char *s, va_list args)
 {

kernel/panic.c

@@ -265,6 +265,7 @@ void panic(const char *fmt, ...)
 		crash_smp_send_stop();
 	}
 
+#if defined(CONFIG_X86) || defined(CONFIG_ARM64_PSEUDO_NMI)
 	/*
 	 * ZAP console related locks when nmi broadcast. If a crash is occurring,
 	 * make sure we can't deadlock. And make sure that we print immediately.
@@ -288,7 +289,6 @@ void panic(const char *fmt, ...)
 	 *	have a chance to see the messages. Others prefer to always
 	 *      reach emergency_restart() and reboot the machine.
 	 */
-#ifdef CONFIG_X86
 	zap_locks();
 #endif
 

kernel/printk/printk.c

@@ -1742,6 +1742,7 @@ static DEFINE_RAW_SPINLOCK(console_owner_lock);
 static struct task_struct *console_owner;
 static bool console_waiter;
 
+#if defined(CONFIG_X86) || defined(CONFIG_ARM64_PSEUDO_NMI)
 void zap_locks(void)
 {
 	if (raw_spin_is_locked(&logbuf_lock)) {
@@ -1758,6 +1759,7 @@ void zap_locks(void)
 
 	sema_init(&console_sem, 1);
 }
+#endif
 
 /**
  * console_lock_spinning_enable - mark beginning of code where another