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Date:   Mon, 17 May 2021 14:46:37 +0900
From:   Masami Hiramatsu <mhiramat@kernel.org>
To:     Tiezhu Yang <yangtiezhu@loongson.cn>
Cc:     Jonathan Corbet <corbet@lwn.net>, Marc Koderer <marc@koderer.com>,
        Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        Christian Brauner <christian.brauner@ubuntu.com>,
        Jisheng Zhang <jszhang@kernel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
        Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Randy Dunlap <rdunlap@infradead.org>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Johannes Thumshirn <jthumshirn@suse.de>,
        Heiko Carstens <hca@linux.ibm.com>,
        Joe Perches <joe@perches.com>, linux-kernel@vger.kernel.org,
        Xuefeng Li <lixuefeng@loongson.cn>
Subject: Re: [PATCH v4 2/2] samples/kprobes: Fix typo in handler_post()
Message-Id: <20210517144637.b781d07770621c3d81b2990e@kernel.org>
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        <1621218083-23519-3-git-send-email-yangtiezhu@loongson.cn>
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On Mon, 17 May 2021 10:21:23 +0800
Tiezhu Yang <yangtiezhu@loongson.cn> wrote:

> It should use post_handler instead of pre_handler in handler_post().
> 
> As Joe Perches suggested, it would be better to use pr_fmt and remove
> all the embedded pre/post/fault strings. This would change the style of
> the output through.
> 

Looks good to me.

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

Thank you!

> Fixes: e16c5dd5157e ("samples/kprobes: Add s390 case in kprobe example module")
> Acked-by: Marc Koderer <marc@koderer.com>
> Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
> Suggested-by: Joe Perches <joe@perches.com>
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
> ---
>  samples/kprobes/kprobe_example.c | 33 +++++++++++++++++----------------
>  1 file changed, 17 insertions(+), 16 deletions(-)
> 
> diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c
> index d77a546..5f1eb8b 100644
> --- a/samples/kprobes/kprobe_example.c
> +++ b/samples/kprobes/kprobe_example.c
> @@ -10,6 +10,8 @@
>   * whenever kernel_clone() is invoked to create a new process.
>   */
>  
> +#define pr_fmt(fmt) "%s: " fmt, __func__
> +
>  #include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/kprobes.h>
> @@ -27,32 +29,31 @@ static struct kprobe kp = {
>  static int __kprobes handler_pre(struct kprobe *p, struct pt_regs *regs)
>  {
>  #ifdef CONFIG_X86
> -	pr_info("<%s> pre_handler: p->addr = 0x%p, ip = %lx, flags = 0x%lx\n",
> +	pr_info("<%s> p->addr = 0x%p, ip = %lx, flags = 0x%lx\n",
>  		p->symbol_name, p->addr, regs->ip, regs->flags);
>  #endif
>  #ifdef CONFIG_PPC
> -	pr_info("<%s> pre_handler: p->addr = 0x%p, nip = 0x%lx, msr = 0x%lx\n",
> +	pr_info("<%s> p->addr = 0x%p, nip = 0x%lx, msr = 0x%lx\n",
>  		p->symbol_name, p->addr, regs->nip, regs->msr);
>  #endif
>  #ifdef CONFIG_MIPS
> -	pr_info("<%s> pre_handler: p->addr = 0x%p, epc = 0x%lx, status = 0x%lx\n",
> +	pr_info("<%s> p->addr = 0x%p, epc = 0x%lx, status = 0x%lx\n",
>  		p->symbol_name, p->addr, regs->cp0_epc, regs->cp0_status);
>  #endif
>  #ifdef CONFIG_ARM64
> -	pr_info("<%s> pre_handler: p->addr = 0x%p, pc = 0x%lx,"
> -			" pstate = 0x%lx\n",
> +	pr_info("<%s> p->addr = 0x%p, pc = 0x%lx, pstate = 0x%lx\n",
>  		p->symbol_name, p->addr, (long)regs->pc, (long)regs->pstate);
>  #endif
>  #ifdef CONFIG_ARM
> -	pr_info("<%s> pre_handler: p->addr = 0x%p, pc = 0x%lx, cpsr = 0x%lx\n",
> +	pr_info("<%s> p->addr = 0x%p, pc = 0x%lx, cpsr = 0x%lx\n",
>  		p->symbol_name, p->addr, (long)regs->ARM_pc, (long)regs->ARM_cpsr);
>  #endif
>  #ifdef CONFIG_RISCV
> -	pr_info("<%s> pre_handler: p->addr = 0x%p, pc = 0x%lx, status = 0x%lx\n",
> +	pr_info("<%s> p->addr = 0x%p, pc = 0x%lx, status = 0x%lx\n",
>  		p->symbol_name, p->addr, regs->epc, regs->status);
>  #endif
>  #ifdef CONFIG_S390
> -	pr_info("<%s> pre_handler: p->addr, 0x%p, ip = 0x%lx, flags = 0x%lx\n",
> +	pr_info("<%s> p->addr, 0x%p, ip = 0x%lx, flags = 0x%lx\n",
>  		p->symbol_name, p->addr, regs->psw.addr, regs->flags);
>  #endif
>  
> @@ -65,31 +66,31 @@ static void __kprobes handler_post(struct kprobe *p, struct pt_regs *regs,
>  				unsigned long flags)
>  {
>  #ifdef CONFIG_X86
> -	pr_info("<%s> post_handler: p->addr = 0x%p, flags = 0x%lx\n",
> +	pr_info("<%s> p->addr = 0x%p, flags = 0x%lx\n",
>  		p->symbol_name, p->addr, regs->flags);
>  #endif
>  #ifdef CONFIG_PPC
> -	pr_info("<%s> post_handler: p->addr = 0x%p, msr = 0x%lx\n",
> +	pr_info("<%s> p->addr = 0x%p, msr = 0x%lx\n",
>  		p->symbol_name, p->addr, regs->msr);
>  #endif
>  #ifdef CONFIG_MIPS
> -	pr_info("<%s> post_handler: p->addr = 0x%p, status = 0x%lx\n",
> +	pr_info("<%s> p->addr = 0x%p, status = 0x%lx\n",
>  		p->symbol_name, p->addr, regs->cp0_status);
>  #endif
>  #ifdef CONFIG_ARM64
> -	pr_info("<%s> post_handler: p->addr = 0x%p, pstate = 0x%lx\n",
> +	pr_info("<%s> p->addr = 0x%p, pstate = 0x%lx\n",
>  		p->symbol_name, p->addr, (long)regs->pstate);
>  #endif
>  #ifdef CONFIG_ARM
> -	pr_info("<%s> post_handler: p->addr = 0x%p, cpsr = 0x%lx\n",
> +	pr_info("<%s> p->addr = 0x%p, cpsr = 0x%lx\n",
>  		p->symbol_name, p->addr, (long)regs->ARM_cpsr);
>  #endif
>  #ifdef CONFIG_RISCV
> -	pr_info("<%s> post_handler: p->addr = 0x%p, status = 0x%lx\n",
> +	pr_info("<%s> p->addr = 0x%p, status = 0x%lx\n",
>  		p->symbol_name, p->addr, regs->status);
>  #endif
>  #ifdef CONFIG_S390
> -	pr_info("<%s> pre_handler: p->addr, 0x%p, flags = 0x%lx\n",
> +	pr_info("<%s> p->addr, 0x%p, flags = 0x%lx\n",
>  		p->symbol_name, p->addr, regs->flags);
>  #endif
>  }
> @@ -101,7 +102,7 @@ static void __kprobes handler_post(struct kprobe *p, struct pt_regs *regs,
>   */
>  static int handler_fault(struct kprobe *p, struct pt_regs *regs, int trapnr)
>  {
> -	pr_info("fault_handler: p->addr = 0x%p, trap #%d\n", p->addr, trapnr);
> +	pr_info("p->addr = 0x%p, trap #%d\n", p->addr, trapnr);
>  	/* Return 0 because we don't handle the fault. */
>  	return 0;
>  }
> -- 
> 2.1.0
> 


-- 
Masami Hiramatsu <mhiramat@kernel.org>