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From:   Arnd Bergmann <arnd@kernel.org>
To:     Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org,
        "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
        Masami Hiramatsu <mhiramat@kernel.org>
Cc:     Arnd Bergmann <arnd@arndb.de>, Vineet Gupta <vgupta@kernel.org>,
        Russell King <linux@armlinux.org.uk>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
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Subject: [PATCH 14/17] kprobes: unify kprobes_exceptions_nofify() prototypes
Date:   Thu, 10 Aug 2023 16:19:32 +0200
Message-Id: <20230810141947.1236730-15-arnd@kernel.org>
In-Reply-To: <20230810141947.1236730-1-arnd@kernel.org>
References: <20230810141947.1236730-1-arnd@kernel.org>
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From: Arnd Bergmann <arnd@arndb.de>

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.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arc/include/asm/kprobes.h     | 3 ---
 arch/arm/include/asm/kprobes.h     | 2 --
 arch/arm64/include/asm/kprobes.h   | 2 --
 arch/ia64/include/asm/kprobes.h    | 2 --
 arch/mips/include/asm/kprobes.h    | 2 --
 arch/powerpc/include/asm/kprobes.h | 2 --
 arch/s390/include/asm/kprobes.h    | 2 --
 arch/sh/include/asm/kprobes.h      | 2 --
 arch/sparc/include/asm/kprobes.h   | 2 --
 arch/x86/include/asm/kprobes.h     | 2 --
 include/linux/kprobes.h            | 4 ++++
 11 files changed, 4 insertions(+), 21 deletions(-)

diff --git a/arch/arc/include/asm/kprobes.h b/arch/arc/include/asm/kprobes.h
index de1566e32cb89..68e8301c0df2c 100644
--- a/arch/arc/include/asm/kprobes.h
+++ b/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;
diff --git a/arch/arm/include/asm/kprobes.h b/arch/arm/include/asm/kprobes.h
index e26a278d301ab..5b8dbf1b0be49 100644
--- a/arch/arm/include/asm/kprobes.h
+++ b/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[];
diff --git a/arch/arm64/include/asm/kprobes.h b/arch/arm64/include/asm/kprobes.h
index 05cd82eeca136..be7a3680dadff 100644
--- a/arch/arm64/include/asm/kprobes.h
+++ b/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);
 
diff --git a/arch/ia64/include/asm/kprobes.h b/arch/ia64/include/asm/kprobes.h
index 9e956768946cc..56004f97df6d2 100644
--- a/arch/ia64/include/asm/kprobes.h
+++ b/arch/ia64/include/asm/kprobes.h
@@ -107,8 +107,6 @@ struct arch_specific_insn {
 };
 
 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 void arch_remove_kprobe(struct kprobe *p);
 
diff --git a/arch/mips/include/asm/kprobes.h b/arch/mips/include/asm/kprobes.h
index 68b1e5d458cfb..bc27d99c94363 100644
--- a/arch/mips/include/asm/kprobes.h
+++ b/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 */
diff --git a/arch/powerpc/include/asm/kprobes.h b/arch/powerpc/include/asm/kprobes.h
index c8e4b4fd4e330..4525a9c68260d 100644
--- a/arch/powerpc/include/asm/kprobes.h
+++ b/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);
diff --git a/arch/s390/include/asm/kprobes.h b/arch/s390/include/asm/kprobes.h
index 83f732ca3af4d..3f87125dd9b0d 100644
--- a/arch/s390/include/asm/kprobes.h
+++ b/arch/s390/include/asm/kprobes.h
@@ -72,8 +72,6 @@ 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)
 
diff --git a/arch/sh/include/asm/kprobes.h b/arch/sh/include/asm/kprobes.h
index eeba83e0a7d29..65d4c3316a5bd 100644
--- a/arch/sh/include/asm/kprobes.h
+++ b/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
 
diff --git a/arch/sparc/include/asm/kprobes.h b/arch/sparc/include/asm/kprobes.h
index 06c2bc767ef75..aec742cd898f2 100644
--- a/arch/sparc/include/asm/kprobes.h
+++ b/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);
diff --git a/arch/x86/include/asm/kprobes.h b/arch/x86/include/asm/kprobes.h
index a2e9317aad495..5939694dfb28d 100644
--- a/arch/x86/include/asm/kprobes.h
+++ b/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
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 85a64cb95d755..987911cdc90a2 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -450,6 +450,10 @@ 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)
-- 
2.39.2