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Date:	Sun, 20 Jul 2014 12:19:19 +0900
From:	Masami Hiramatsu <>
To:	Steven Rostedt <>
Cc:	Josh Poimboeuf <>,
	Ingo Molnar <>,
	Namhyung Kim <>,
	Ananth N Mavinakayanahalli <>,
	Linux Kernel Mailing List <>
Subject: Re: Re: [PATCH ftrace/core v3 2/3] ftrace, kprobes: Support IPMODIFY
 flag to find IP modify conflict

(2014/07/18 22:51), Steven Rostedt wrote:
> On Fri, 18 Jul 2014 16:09:07 +0900
> Masami Hiramatsu <> wrote:
>>> "The ops can modify the IP register. This can only be set along with
>>> SAVE_REGS. If another ops is already registered for any of the
>>> functions that this ops will be registered for, then this ops will fail
>>> to register."
>> Not only register, but also set_filter_ip ;)
>> "...will fail to register or set_filter_ip."
> Sure.
>>>> diff --git a/kernel/kprobes.c b/kernel/kprobes.c
>>>> index 3214289..e52d86f 100644
>>>> --- a/kernel/kprobes.c
>>>> +++ b/kernel/kprobes.c
>>> I think this should be split into two patches. One that adds the ftrace
>>> infrastructure, and the other that adds the kprobes user of the
>>> IPMODIFY flag.
>> Hmm, I thought that it was natural to introduce new feature and its user
>> together, so that we could use git-bisect safely.
> It should still be bisect friendly. That is, the feature is added
> before the user, not the user before the feature ;-)

Ah, I see.

> I know some people like the feature and user in one patch, but for me,
> when the user is in a different sub system (here it's kprobes) from the
> infrastructure that is changing (ftrace), I prefer separate patches.
> The user patch shows me where the users are. When they are one patch, I
> tend to have them get lost.

OK, then I'll decouple it :)


Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory

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