samples/kretprobe: convert the printk to pr_info/pr_err

We prefer to use the pr_* to print out the log now, this patch converts
the printk to pr_info.  In the error path, use the pr_err to replace the
printk.

Link: http://lkml.kernel.org/r/1464143083-3877-3-git-send-email-shijie.huang@arm.com
Signed-off-by: Huang Shijie <shijie.huang@arm.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Steve Capper <steve.capper@arm.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/samples/kprobes/kretprobe_example.c b/samples/kprobes/kretprobe_example.c
index ebb1d1a..adc83e9 100644 (file)
--- a/samples/kprobes/kretprobe_example.c
+++ b/samples/kprobes/kretprobe_example.c
@@ -62,7 +62,7 @@ static int ret_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
 
        now = ktime_get();
        delta = ktime_to_ns(ktime_sub(now, data->entry_stamp));
-       printk(KERN_INFO "%s returned %d and took %lld ns to execute\n",
+       pr_info("%s returned %d and took %lld ns to execute\n",
                        func_name, retval, (long long)delta);
        return 0;
 }
@@ -82,11 +82,10 @@ static int __init kretprobe_init(void)
        my_kretprobe.kp.symbol_name = func_name;
        ret = register_kretprobe(&my_kretprobe);
        if (ret < 0) {
-               printk(KERN_INFO "register_kretprobe failed, returned %d\n",
-                               ret);
+               pr_err("register_kretprobe failed, returned %d\n", ret);
                return -1;
        }
-       printk(KERN_INFO "Planted return probe at %s: %p\n",
+       pr_info("Planted return probe at %s: %p\n",
                        my_kretprobe.kp.symbol_name, my_kretprobe.kp.addr);
        return 0;
 }
@@ -94,11 +93,10 @@ static int __init kretprobe_init(void)
 static void __exit kretprobe_exit(void)
 {
        unregister_kretprobe(&my_kretprobe);
-       printk(KERN_INFO "kretprobe at %p unregistered\n",
-                       my_kretprobe.kp.addr);
+       pr_info("kretprobe at %p unregistered\n", my_kretprobe.kp.addr);
 
        /* nmissed > 0 suggests that maxactive was set too low. */
-       printk(KERN_INFO "Missed probing %d instances of %s\n",
+       pr_info("Missed probing %d instances of %s\n",
                my_kretprobe.nmissed, my_kretprobe.kp.symbol_name);
 }