linux-kernel - [PATCH] livepatch: use FTRACE_OPS_FL

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Message-ID: <20141218154935.GA6887@treble.redhat.com>
Date:	Thu, 18 Dec 2014 09:49:35 -0600
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Seth Jennings <sjenning@...hat.com>, Jiri Kosina <jkosina@...e.cz>,
	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>,
	live-patching@...r.kernel.org, x86@...nel.org, kpatch@...hat.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH] livepatch: use FTRACE_OPS_FL_IPMODIFY

On Thu, Dec 18, 2014 at 08:55:21PM +0900, Masami Hiramatsu wrote:
> (2014/12/17 2:58), Seth Jennings wrote:
> > changes in v7:
> > - TODO: set IPMODIFY (not a blocker to moving forward)
> 
> Why don't you set this?
> IPMODIFY series are not completely applied yet, but you can already
> use the flag. All you need is just set it :)

Yeah, I don't see any reason why we can't start using this flag now.
How about we add this patch to the queue?

-->8--

Subject: livepatch: use FTRACE_OPS_FL_IPMODIFY

Use the FTRACE_OPS_FL_IPMODIFY flag to prevent conflicts with other
ftrace users who also modify regs->ip.

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 kernel/livepatch/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 0004a71..bdd99975 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -640,7 +640,8 @@ static int klp_init_func(struct klp_object *obj, struct klp_func *func)
 
 	ops->private = func;
 	ops->func = klp_ftrace_handler;
-	ops->flags = FTRACE_OPS_FL_SAVE_REGS | FTRACE_OPS_FL_DYNAMIC;
+	ops->flags = FTRACE_OPS_FL_SAVE_REGS | FTRACE_OPS_FL_DYNAMIC |
+		     FTRACE_FL_IPMODIFY;
 	func->fops = ops;
 	func->state = KLP_DISABLED;
 
-- 
2.1.0

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