linux-kernel - Re: [PATCH 3/3] kobject: fix warnings use pr

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Date:   Wed, 31 Oct 2018 09:41:10 -0400
From:   YU Bo <tsu.yubo@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     gregkh@...uxfoundation.org, rafael@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] kobject: fix warnings use pr_* to replace  printk

Hi,
On Tue, Oct 30, 2018 at 08:01:50AM -0700, Joe Perches wrote:
>On Tue, 2018-10-30 at 08:01 -0400, Bo YU wrote:
>> Fix warning from checkpatch.pl use pr_* to replace printk
>
>If you look at msg, it can be unterminated with newline.
>
>> diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
>[]
>> @@ -224,7 +224,7 @@ int kobject_synth_uevent(struct kobject *kobj, const char *buf, size_t count)
>>  out:
>>  	if (r) {
>>  		devpath = kobject_get_path(kobj, GFP_KERNEL);
>> -		printk(KERN_WARNING "synth uevent: %s: %s",
>> +		pr_warn("synth uevent: %s: %s",
>>  		       devpath ?: "unknown device",
>>  		       msg ?: "failed to send uevent");
>>  		kfree(devpath);
>
>Perhaps this block should be:
>
>diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
>index 63d0816ab23b..0ba1197f366e 100644
>--- a/lib/kobject_uevent.c
>+++ b/lib/kobject_uevent.c
>@@ -195,12 +195,12 @@ int kobject_synth_uevent(struct kobject *kobj, const char *buf, size_t count)
> 	enum kobject_action action;
> 	const char *action_args;
> 	struct kobj_uevent_env *env;
>-	const char *msg = NULL, *devpath;
>+	const char *msg = NULL;
> 	int r;
>
> 	r = kobject_action_type(buf, count, &action, &action_args);
> 	if (r) {
>-		msg = "unknown uevent action string\n";
>+		msg = "unknown uevent action string";
> 		goto out;
> 	}
>
>@@ -212,7 +212,7 @@ int kobject_synth_uevent(struct kobject *kobj, const char *buf, size_t count)
> 	r = kobject_action_args(action_args,
> 				count - (action_args - buf), &env);
> 	if (r == -EINVAL) {
>-		msg = "incorrect uevent action arguments\n";
>+		msg = "incorrect uevent action arguments";
> 		goto out;
> 	}
>
>@@ -223,10 +223,11 @@ int kobject_synth_uevent(struct kobject *kobj, const char *buf, size_t count)
> 	kfree(env);
> out:
> 	if (r) {
>-		devpath = kobject_get_path(kobj, GFP_KERNEL);
>-		printk(KERN_WARNING "synth uevent: %s: %s",
>-		       devpath ?: "unknown device",
>-		       msg ?: "failed to send uevent");
>+		char *devpath devpath = kobject_get_path(kobj, GFP_KERNEL);
>+
>+		pr_warn("synth uevent: %s: %s\n",
>+			devpath ?: "unknown device",
>+			msg ?: "failed to send uevent");
> 		kfree(devpath);
> 	}
> 	return r;
Sorry, but i have two stupid questions to annoy you:
Q1: If i agree with your patch, here should i to do? Acked-by tag or others or nothing to do?
Q2: In fact, i do not know how to test the patch. Only to cat /sys/bus/pci/* or something?
Thanks,
>
>