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 09:21:03 -0600 [thread overview]
Message-ID: <20141121152103.GB26264@treble.redhat.com> (raw)
In-Reply-To: <alpine.LNX.2.00.1411210102280.23174@pobox.suse.cz>
On Fri, Nov 21, 2014 at 01:22:33AM +0100, Jiri Kosina wrote:
> On Thu, 20 Nov 2014, Seth Jennings wrote:
> > --- /dev/null
> > +++ b/kernel/livepatch/Kconfig
> > @@ -0,0 +1,18 @@
> > +config ARCH_HAVE_LIVE_PATCHING
> > + boolean
> > + help
> > + Arch supports kernel live patching
> > +
> > +config LIVE_PATCHING
> > + boolean "Kernel Live Patching"
> > + depends on DYNAMIC_FTRACE_WITH_REGS
> > + depends on MODULES
> > + depends on SYSFS
> > + depends on KALLSYMS_ALL
> > + depends on ARCH_HAVE_LIVE_PATCHING
>
> We have to refuse to build on x86_64 if the compiler doesn't support
> fentry. mcount is not really usable (well, it would be possible to use it,
> be the obstacles are too big to care).
>
> Something like [1] should be applicable here as well I believe.
>
> [1] https://git.kernel.org/cgit/linux/kernel/git/jirislaby/kgraft.git/commit/?h=kgraft&id=bd4bc097c72937d18036f1312a4d79ed0bea9991
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.
--
Josh
next prev parent reply other threads:[~2014-11-21 15:21 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 [this message]
2014-11-21 15:27 ` Jiri Kosina
2014-11-21 15:35 ` Josh Poimboeuf
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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