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From:   Tiezhu Yang <yangtiezhu@loongson.cn>
To:     Jonathan Corbet <corbet@lwn.net>, Marc Koderer <marc@koderer.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        Christian Brauner <christian.brauner@ubuntu.com>,
        Jisheng Zhang <jszhang@kernel.org>,
        Heiko Carstens <hca@linux.ibm.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Johannes Thumshirn <jthumshirn@suse.de>,
        Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
        Randy Dunlap <randy.dunlap@oracle.com>,
        Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Joe Perches <joe@perches.com>
Cc:     linux-kernel@vger.kernel.org, Xuefeng Li <lixuefeng@loongson.cn>
Subject: [PATCH v3] samples/kprobes: Fix typo in handler_{post,fault}()
Date:   Sat, 15 May 2021 10:39:06 +0800
Message-Id: <1621046346-7855-1-git-send-email-yangtiezhu@loongson.cn>
Precedence: bulk

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 strings. This would change the style of the
output through.

Also fix a defective format in handler_fault() ending with an 'n' that
should be '\n'.

Fixes: e16c5dd5157e ("samples/kprobes: Add s390 case in kprobe example module")
Fixes: 804defea1c02 ("Kprobes: move kprobe examples to samples/")
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>
---

v3: use pr_fmt and fix typo in handler_fault() suggested by Joe Perches

v2: rebase on the latest mainline kernel

 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 c495664..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 #%dn", 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