linux-kernel - Re: livepatching tree for linux-next

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Message-ID: <alpine.LNX.2.00.1501091100530.15299@pobox.suse.cz>
Date:	Fri, 9 Jan 2015 11:03:35 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
	linux-next@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: Re: livepatching tree for linux-next

On Wed, 7 Jan 2015, Andrew Morton wrote:

> > --- a/kernel/livepatch/core.c
> > +++ b/kernel/livepatch/core.c
> > @@ -911,6 +911,12 @@ static int klp_init(void)
> >  {
> >  	int ret;
> >  
> > +	ret = klp_check_compiler_support();
> > +	if (ret) {
> > +		pr_info("Your compiler is too old; turning off.\n");
> > +		return -EINVAL;
> > +	}
> > +
> 
> Looks reasonable.  

I've applied it and pushed out.

> It's a shame we've never figured out a way to do this at Kconfig-time.

The biggest problems probably is: what if you supply different CC during 
build? Then you'll have to invalidate all dependencies and restart the 
whole dependency resolution. The same goes for cross-compilation I guess.

-- 
Jiri Kosina
SUSE Labs
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