linux-kernel - Re: [PATCHv3 2/3] kernel: add support for live patching

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Message-ID: <alpine.LNX.2.00.1411211626110.23174@pobox.suse.cz>
Date:	Fri, 21 Nov 2014 16:27:57 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
cc:	Seth Jennings <sjenning@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Steven Rostedt <rostedt@...dmis.org>,
	Petr Mladek <pmladek@...e.cz>, Miroslav Benes <mbenes@...e.cz>,
	Christoph Hellwig <hch@...radead.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	live-patching@...r.kernel.org, x86@...nel.org, kpatch@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 2/3] kernel: add support for live patching

On Fri, 21 Nov 2014, Josh Poimboeuf wrote:

> I think we can use "depends on HAVE_FENTRY" to accomplish this, since 
> CC_USING_FENTRY gets set by the top level kernel Makefile if 
> CONFIG_HAVE_FENTRY is set.

The problem is that HAVE_FENTRY is set automatically on x86_64, no matter 
whether your actual compiler supports it or not.

CC_USING_FENTRY is defined if and only if the actual currently used 
compiler supports it, but that can't be expressed in Kconfig.

-- 
Jiri Kosina
SUSE Labs
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