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

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Date:	Wed, 7 Jan 2015 15:57:01 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jiri Kosina <jkosina@...e.cz>
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 Thu, 8 Jan 2015 00:49:49 +0100 (CET) Jiri Kosina <jkosina@...e.cz> 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.  It's a shame we've never figured out a way to do
this at Kconfig-time.


That second #error doing in livepatch.h is a bit odd.  It errors out if
anyone includes livepatch.h when CONFIG_LIVE_PATCHING=n.  Methinks it
would be saner to change it to

#error include linux/livepatch.h, not asm/livepatch.h



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