kprobes: unify kprobes_exceptions_nofify() prototypes

Most architectures that support kprobes declare this function in their
own asm/kprobes.h header and provide an override, but some are missing
the prototype, which causes a warning for the __weak stub implementation:

kernel/kprobes.c:1865:12: error: no previous prototype for 'kprobe_exceptions_notify' [-Werror=missing-prototypes]
 1865 | int __weak kprobe_exceptions_notify(struct notifier_block *self,

Move the prototype into linux/kprobes.h so it is visible to all
the definitions.

Link: https://lore.kernel.org/all/[email protected]/

Acked-by: Masami Hiramatsu (Google) <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>
Signed-off-by: Masami Hiramatsu (Google) <[email protected]>

Author: arndb

arch/arc/include/asm/kprobes.h

@@ -32,9 +32,6 @@ struct kprobe;
 
 void arch_remove_kprobe(struct kprobe *p);
 
-int kprobe_exceptions_notify(struct notifier_block *self,
-			     unsigned long val, void *data);
-
 struct prev_kprobe {
 	struct kprobe *kp;
 	unsigned long status;

arch/arm/include/asm/kprobes.h

@@ -40,8 +40,6 @@ struct kprobe_ctlblk {
 
 void arch_remove_kprobe(struct kprobe *);
 int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr);
-int kprobe_exceptions_notify(struct notifier_block *self,
-			     unsigned long val, void *data);
 
 /* optinsn template addresses */
 extern __visible kprobe_opcode_t optprobe_template_entry[];

arch/arm64/include/asm/kprobes.h

@@ -37,8 +37,6 @@ struct kprobe_ctlblk {
 
 void arch_remove_kprobe(struct kprobe *);
 int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr);
-int kprobe_exceptions_notify(struct notifier_block *self,
-			     unsigned long val, void *data);
 void __kretprobe_trampoline(void);
 void __kprobes *trampoline_probe_handler(struct pt_regs *regs);
 

arch/mips/include/asm/kprobes.h

@@ -71,8 +71,6 @@ struct kprobe_ctlblk {
 	struct prev_kprobe prev_kprobe;
 };
 
-extern int kprobe_exceptions_notify(struct notifier_block *self,
-				    unsigned long val, void *data);
 
 #endif /* CONFIG_KPROBES */
 #endif /* _ASM_KPROBES_H */

arch/powerpc/include/asm/kprobes.h

@@ -84,8 +84,6 @@ struct arch_optimized_insn {
 	kprobe_opcode_t *insn;
 };
 
-extern int kprobe_exceptions_notify(struct notifier_block *self,
-					unsigned long val, void *data);
 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
 extern int kprobe_handler(struct pt_regs *regs);
 extern int kprobe_post_handler(struct pt_regs *regs);

arch/s390/include/asm/kprobes.h

@@ -73,8 +73,6 @@ struct kprobe_ctlblk {
 void arch_remove_kprobe(struct kprobe *p);
 
 int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
-int kprobe_exceptions_notify(struct notifier_block *self,
-	unsigned long val, void *data);
 
 #define flush_insn_slot(p)	do { } while (0)
 

arch/sh/include/asm/kprobes.h

@@ -46,8 +46,6 @@ struct kprobe_ctlblk {
 };
 
 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
-extern int kprobe_exceptions_notify(struct notifier_block *self,
-				    unsigned long val, void *data);
 extern int kprobe_handle_illslot(unsigned long pc);
 #else
 

arch/sparc/include/asm/kprobes.h

@@ -47,8 +47,6 @@ struct kprobe_ctlblk {
 	struct prev_kprobe prev_kprobe;
 };
 
-int kprobe_exceptions_notify(struct notifier_block *self,
-			     unsigned long val, void *data);
 int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
 asmlinkage void __kprobes kprobe_trap(unsigned long trap_level,
 				      struct pt_regs *regs);

arch/x86/include/asm/kprobes.h

@@ -113,8 +113,6 @@ struct kprobe_ctlblk {
 };
 
 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
-extern int kprobe_exceptions_notify(struct notifier_block *self,
-				    unsigned long val, void *data);
 extern int kprobe_int3_handler(struct pt_regs *regs);
 
 #else

include/linux/kprobes.h

@@ -445,6 +445,10 @@ int kprobe_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 
 int arch_kprobe_get_kallsym(unsigned int *symnum, unsigned long *value,
 			    char *type, char *sym);
+
+int kprobe_exceptions_notify(struct notifier_block *self,
+			     unsigned long val, void *data);
+
 #else /* !CONFIG_KPROBES: */
 
 static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)