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

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Date:   Wed, 31 Oct 2018 09:48:15 -0700
From:   Joe Perches <joe@...ches.com>
To:     YU Bo <tsu.yubo@...il.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, 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.