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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/include/linux/sysrq.h
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@@ -30,10 +30,10 @@
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 #define SYSRQ_ENABLE_RTNICE	0x0100
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 struct sysrq_key_op {
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-	void (*handler)(int);
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-	char *help_msg;
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-	char *action_msg;
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-	int enable_mask;
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+	void (* const handler)(int);
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+	const char * const help_msg;
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+	const char * const action_msg;
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+	const int enable_mask;
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 };
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 #ifdef CONFIG_MAGIC_SYSRQ
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@@ -45,11 +45,12 @@
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 void handle_sysrq(int key);
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 void __handle_sysrq(int key, bool check_mask);
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-int register_sysrq_key(int key, struct sysrq_key_op *op);
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-int unregister_sysrq_key(int key, struct sysrq_key_op *op);
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-struct sysrq_key_op *__sysrq_get_key_op(int key);
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+int register_sysrq_key(int key, const struct sysrq_key_op *op);
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+int unregister_sysrq_key(int key, const struct sysrq_key_op *op);
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+extern const struct sysrq_key_op *__sysrq_reboot_op;
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 int sysrq_toggle_support(int enable_mask);
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+int sysrq_mask(void);
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 #else
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@@ -61,16 +62,22 @@
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 {
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 }
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-static inline int register_sysrq_key(int key, struct sysrq_key_op *op)
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+static inline int register_sysrq_key(int key, const struct sysrq_key_op *op)
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 {
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 	return -EINVAL;
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 }
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-static inline int unregister_sysrq_key(int key, struct sysrq_key_op *op)
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+static inline int unregister_sysrq_key(int key, const struct sysrq_key_op *op)
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 {
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 	return -EINVAL;
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 }
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+static inline int sysrq_mask(void)
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+{
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+	/* Magic SysRq disabled mask */
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+	return 0;
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+}
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+
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 #endif
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 #endif /* _LINUX_SYSRQ_H */