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From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Jiri Kosina <jkosina@suse.cz>
Cc: Seth Jennings <sjenning@redhat.com>,
	Vojtech Pavlik <vojtech@suse.cz>,
	Steven Rostedt <rostedt@goodmis.org>,
	Petr Mladek <pmladek@suse.cz>, Miroslav Benes <mbenes@suse.cz>,
	Christoph Hellwig <hch@infradead.org>,
	Greg KH <gregkh@linuxfoundation.org>,
	Andy Lutomirski <luto@amacapital.net>,
	Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
	live-patching@vger.kernel.org, x86@kernel.org, kpatch@redhat.com,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCHv3 2/3] kernel: add support for live patching
Date: Fri, 21 Nov 2014 09:35:35 -0600	[thread overview]
Message-ID: <20141121153535.GC26264@treble.redhat.com> (raw)
In-Reply-To: <alpine.LNX.2.00.1411211626110.23174@pobox.suse.cz>

On Fri, Nov 21, 2014 at 04:27:57PM +0100, Jiri Kosina wrote:
> 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.

Ah, light bulb moment.  Now I understand what "$(call cc-option, ...)"
does.

Thanks :-)

-- 
Josh

  reply	other threads:[~2014-11-21 15:36 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-20 22:29 [PATCHv3 0/3] Kernel Live Patching Seth Jennings
2014-11-20 22:29 ` [PATCHv3 1/3] kernel: add TAINT_LIVEPATCH Seth Jennings
2014-11-20 22:29 ` [PATCHv3 2/3] kernel: add support for live patching Seth Jennings
2014-11-21  0:22   ` Jiri Kosina
2014-11-21 14:44     ` Miroslav Benes
2014-11-21 15:00       ` Josh Poimboeuf
2014-11-21 15:46         ` Miroslav Benes
2014-11-21 16:13           ` Seth Jennings
2014-11-21 15:21     ` Josh Poimboeuf
2014-11-21 15:27       ` Jiri Kosina
2014-11-21 15:35         ` Josh Poimboeuf [this message]
2014-11-21 16:40     ` Seth Jennings
2014-11-21 17:35       ` Jiri Slaby
2014-11-21 18:29         ` Seth Jennings
2014-11-21 17:53       ` Andy Lutomirski
2014-11-21  2:39   ` Masami Hiramatsu
2014-11-25 16:39     ` Petr Mladek
2014-11-25 16:52       ` Steven Rostedt
2014-11-25 17:04         ` Petr Mladek
2014-11-25 17:16           ` Steven Rostedt
2014-11-25 19:29             ` Jiri Kosina
2014-12-03  8:09               ` Masami Hiramatsu
2014-11-24 11:13   ` Thomas Gleixner
2014-11-24 13:21     ` Jiri Kosina
2014-11-24 13:26       ` Thomas Gleixner
2014-11-24 13:31         ` Vojtech Pavlik
2014-11-24 14:25           ` Masami Hiramatsu
2014-11-24 13:31         ` Jiri Kosina
2014-11-24 13:23     ` Vojtech Pavlik
2014-11-24 13:24     ` Josh Poimboeuf
2014-11-24 13:27     ` Masami Hiramatsu
2014-11-20 22:29 ` [PATCHv3 3/3] kernel: add sysfs documentation " Seth Jennings
2014-11-21  2:49   ` Masami Hiramatsu
2014-11-21 16:41     ` Seth Jennings
2014-11-21  2:44 ` [PATCHv3 0/3] Kernel Live Patching Masami Hiramatsu

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