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Date:   Fri, 11 Aug 2023 20:46:11 +0900
From:   Masami Hiramatsu (Google) <mhiramat@kernel.org>
To:     Arnd Bergmann <arnd@kernel.org>
Cc:     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>,
        Arnd Bergmann <arnd@arndb.de>,
        Vineet Gupta <vgupta@kernel.org>,
        Russell King <linux@armlinux.org.uk>,
        Catalin Marinas <catalin.marinas@arm.com>,
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Subject: Re: [PATCH 14/17] kprobes: unify kprobes_exceptions_nofify()
 prototypes
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        <20230810141947.1236730-15-arnd@kernel.org>
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On Thu, 10 Aug 2023 16:19:32 +0200
Arnd Bergmann <arnd@kernel.org> wrote:

> 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.

Good catch! and it seems x86 has no implementation, so this is more resonable.

Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

Thank you,

> 
> 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
> 


-- 
Masami Hiramatsu (Google) <mhiramat@kernel.org>