linux-kernel - Re: [RFC PATCH 4/9] livepatch: get function sizes

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Message-ID: <20150210185349.GJ21643@treble.redhat.com>
Date:	Tue, 10 Feb 2015 12:53:49 -0600
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Seth Jennings <sjenning@...hat.com>, Jiri Kosina <jkosina@...e.cz>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 4/9] livepatch: get function sizes

On Tue, Feb 10, 2015 at 07:30:50PM +0100, Jiri Slaby wrote:
> On 02/09/2015, 06:31 PM, Josh Poimboeuf wrote:
> > --- a/kernel/livepatch/core.c
> > +++ b/kernel/livepatch/core.c
> > @@ -197,8 +197,25 @@ static int klp_find_verify_func_addr(struct klp_object *obj,
> >  	else
> >  		ret = klp_verify_vmlinux_symbol(func->old_name,
> >  						func->old_addr);
> > +	if (ret)
> > +		return ret;
> >  
> > -	return ret;
> > +	ret = kallsyms_lookup_size_offset(func->old_addr, &func->old_size,
> > +					  NULL);
> > +	if (!ret) {
> > +		pr_err("kallsyms lookup failed for '%s'\n", func->old_name);
> > +		return -EINVAL;
> > +	}
> > +
> > +	ret = kallsyms_lookup_size_offset((unsigned long)func->new_func,
> > +					  &func->new_size, NULL);
> > +	if (!ret) {
> > +		pr_err("kallsyms lookup failed for '%s' replacement\n",
> > +		       func->old_name);
> > +		return -EINVAL;
> 
> EINVAL does not seem to be an appropriate return value for "not found".
> Maybe ENOENT?

Ok.

-- 
Josh
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