linux-kernel - Re: [PATCH -tip v2 0/5] kprobes: x86: Cleanup jprobe implementation on x86

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Date:   Wed, 16 May 2018 16:00:45 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, x86@...nel.org,
        Yang Bo <yangbo@...pin.com>, Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Laura Abbott <labbott@...hat.com>, Josef Bacik <jbacik@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Subject: Re: [PATCH -tip v2 0/5] kprobes: x86: Cleanup jprobe implementation
 on x86

On Mon, 12 Mar 2018 23:40:55 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Hello,
> 
> Since we decided to remove jprobe from kernel last year,
> its APIs are disabled and we worked on moving in-kernel
> jprobe users to kprobes or trace-events. And now no jprobe
> users are here anymore.
> 
> This series removes jprobe implementation from x86 and
> generic code. I would like to send other series for each
> arch. After all those patches are merged, I will remove
> jprobes APIs and data structures, since changing those
> definitions will break build on other archs.
> 
> Here is the series of patches to show how to do that.
> I've dropped arch-independent header changes from this
> version and merged kprobe-user code changes into the
> last patch since that changed the kprobes expected
> behavior when the kprobes modifies execution path.
> (no need to enable preempt anymore)
> 
>  - Remove jprobe functions (register/unregister,
>    setjump/longjump) from generic/arch-dependent code.
>    [1/5][2/5]
>  - Remove break_handler related code.
>    [3/5][4/5]
>  - Do not disable preemption on exception handler
>    [5/5]
> 
> As I said above, the last patch [5/5] will change the
> expected behavior on x86. Other archs also have to change
> it. But anyway, currently such execution-path modifying
> users in tree are very limited and only works on x86.
> So we can safely modify it.

Ah, I forgot I had sent this in March... 
Basically, this is same thing what I sent last week, and this is more
aggressively removing all the jprobes related code including
break_handler. I would like to merge both series and start sending
new series, including removing jprobe test code too.

Thank you,

-- 
Masami Hiramatsu <mhiramat@...nel.org>