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Date: Mon, 17 May 2021 14:46:37 +0900
From: Masami Hiramatsu <mhiramat@...nel.org>
To: Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc: Jonathan Corbet <corbet@....net>, Marc Koderer <marc@...erer.com>,
Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
Christian Brauner <christian.brauner@...ntu.com>,
Jisheng Zhang <jszhang@...nel.org>,
Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
Ananth N Mavinakayanahalli <ananth@...ibm.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Randy Dunlap <rdunlap@...radead.org>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
Johannes Thumshirn <jthumshirn@...e.de>,
Heiko Carstens <hca@...ux.ibm.com>,
Joe Perches <joe@...ches.com>, linux-kernel@...r.kernel.org,
Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [PATCH v4 2/2] samples/kprobes: Fix typo in handler_post()
On Mon, 17 May 2021 10:21:23 +0800
Tiezhu Yang <yangtiezhu@...ngson.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@...nel.org>
Thank you!
> Fixes: e16c5dd5157e ("samples/kprobes: Add s390 case in kprobe example module")
> Acked-by: Marc Koderer <marc@...erer.com>
> Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
> Suggested-by: Joe Perches <joe@...ches.com>
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.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@...nel.org>
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