linux-kernel - Re: [RFC PATCH 4/5] samples: livepatch: init reloc list and mark as klp module

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Message-ID: <20151110135006.GB3163@treble.redhat.com>
Date:	Tue, 10 Nov 2015 07:50:06 -0600
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Jessica Yu <jeyu@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Vojtech Pavlik <vojtech@...e.com>,
	Miroslav Benes <mbenes@...e.cz>, linux-api@...r.kernel.org,
	live-patching@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 4/5] samples: livepatch: init reloc list and mark as
 klp module

On Tue, Nov 10, 2015 at 09:15:54AM +0100, Jiri Slaby wrote:
> On 11/10/2015, 05:45 AM, Jessica Yu wrote:
> > Intialize the list of relocation sections in the sample
> > klp_object (even if the list will be empty in this case).
> > Also mark module as a livepatch module so that the module
> > loader can appropriately initialize it.
> > 
> > Signed-off-by: Jessica Yu <jeyu@...hat.com>
> > ---
> >  samples/livepatch/livepatch-sample.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/samples/livepatch/livepatch-sample.c b/samples/livepatch/livepatch-sample.c
> > index fb8c861..2ef9345 100644
> > --- a/samples/livepatch/livepatch-sample.c
> > +++ b/samples/livepatch/livepatch-sample.c
> > @@ -57,6 +57,7 @@ static struct klp_object objs[] = {
> >  	{
> >  		/* name being NULL means vmlinux */
> >  		.funcs = funcs,
> > +		.reloc_secs = LIST_HEAD_INIT(objs[0].reloc_secs)
> 
> And I see now. This is not the best place for it though. I would put
> INIT_LIST_HEAD in the core code instead.

Maybe the reloc_secs list should instead be an array of klp_reloc_sec
structs, with the last entry being 0, similar to how we do other "lists"
in the klp interface (e.g., klp_patch.objs, klp_object.funcs).

-- 
Josh
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