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

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Date:   Thu, 1 Nov 2018 07:24:12 -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

On Wed, Oct 31, 2018 at 09:48:15AM -0700, Joe Perches wrote:
>On Wed, 2018-10-31 at 09:41 -0400, YU Bo wrote:
>> 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?
>
>Send V2 with content and explanation of what
>it does and why.
>
>> Q2: In fact, i do not know how to test the patch. Only to cat /sys/bus/pci/* or something?
>
>That wouldn't work as these go to dmesg only on
>certain conditions.
>
>It's a trivial patch, obviously correct.
Thank you, joe, i will do.
>
>