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From: Masami Hiramatsu <mhiramat@kernel.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	x86@kernel.org, Ingo Molnar <mingo@redhat.com>,
	"H . Peter Anvin" <hpa@zytor.com>,
	linux-kernel@vger.kernel.org,
	Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Laura Abbott <labbott@redhat.com>, Josef Bacik <jbacik@fb.com>,
	Alexei Starovoitov <ast@kernel.org>,
	Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Subject: Re: [PATCH -tip v3 4/7] kprobes: Ignore break_handler
Date: Fri, 18 May 2018 22:38:03 +0900	[thread overview]
Message-ID: <20180518223803.b120da47fd2908fe4c9785ad@kernel.org> (raw)
In-Reply-To: <20180518061635.GA27960@gmail.com>

On Fri, 18 May 2018 08:16:36 +0200
Ingo Molnar <mingo@kernel.org> wrote:

> 
> * Masami Hiramatsu <mhiramat@kernel.org> wrote:
> 
> > Ignore break_handler related code because it was only
> > used by jprobe and jprobe is removed.
> > 
> > Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
> > ---
> >  Documentation/kprobes.txt |    2 +-
> >  kernel/kprobes.c          |   39 +++++----------------------------------
> >  2 files changed, 6 insertions(+), 35 deletions(-)
> 
> Even after all these changes there's quite a bit of ->break_handler() use:
> 
> triton:~/tip> git grep -w break_handler
> arch/arc/kernel/kprobes.c:              if (p->break_handler && p->break_handler(p, regs)) {
> arch/arm/probes/kprobes/core.c:                  * for calling the break_handler below on re-entry,
> arch/arm/probes/kprobes/core.c:         if (cur->break_handler && cur->break_handler(cur, regs)) {
> arch/arm64/kernel/probes/kprobes.c:                      * for calling the break_handler below on re-entry,
> arch/arm64/kernel/probes/kprobes.c:             if (cur_kprobe->break_handler  &&
> arch/arm64/kernel/probes/kprobes.c:                  cur_kprobe->break_handler(cur_kprobe, regs)) {
> arch/ia64/kernel/kprobes.c:                     if (p->break_handler && p->break_handler(p, regs)) {
> arch/mips/kernel/kprobes.c:                     if (p->break_handler && p->break_handler(p, regs))
> arch/powerpc/kernel/kprobes.c:                  if (p->break_handler && p->break_handler(p, regs)) {
> arch/s390/kernel/kprobes.c:                      * for calling the break_handler below on re-entry
> arch/s390/kernel/kprobes.c:             if (p->break_handler && p->break_handler(p, regs)) {
> arch/s390/kernel/kprobes.c:                      * break_handler "returns" to the original
> arch/sh/kernel/kprobes.c:                       if (p->break_handler && p->break_handler(p, regs)) {
> arch/sh/kernel/kprobes.c:                                       if (p->break_handler &&
> arch/sh/kernel/kprobes.c:                                           p->break_handler(p, args->regs))
> arch/sparc/kernel/kprobes.c:                    if (p->break_handler && p->break_handler(p, regs))
> arch/x86/include/asm/kprobes.h:  * a post_handler or break_handler).
> include/linux/kprobes.h:        kprobe_break_handler_t break_handler;
> 
> Nothing appears to be actually _setting_ the break_handler, so all of this is 
> stale code as well which should be removed?

Yes, break_handler() is only for jprobe, not for user-defined handler.
I already have a series of those patches, but I think I need to send it
to each arch maintainer.

Thank you,

> 
> Thanks,
> 
> 	Ingo


-- 
Masami Hiramatsu <mhiramat@kernel.org>

  reply	other threads:[~2018-05-18 13:38 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-16 23:56 [PATCH -tip v3 0/7] kprobes: x86: Cleanup jprobe implementation on x86 Masami Hiramatsu
2018-05-16 23:57 ` [PATCH -tip v3 1/7] Documentation/kprobes: Fix to remove remaining jprobe Masami Hiramatsu
2018-05-16 23:57 ` [PATCH -tip v3 2/7] kprobes: Remove jprobe API implementation Masami Hiramatsu
2018-05-16 23:58 ` [PATCH -tip v3 3/7] x86: kprobes: Remove jprobe implementation Masami Hiramatsu
2018-05-16 23:58 ` [PATCH -tip v3 4/7] kprobes: Ignore break_handler Masami Hiramatsu
2018-05-18  6:16   ` Ingo Molnar
2018-05-18 13:38     ` Masami Hiramatsu [this message]
2018-05-18  6:20   ` Ingo Molnar
2018-05-18 14:14     ` Masami Hiramatsu
2018-05-16 23:59 ` [PATCH -tip v3 5/7] x86: " Masami Hiramatsu
2018-05-18  6:26   ` Ingo Molnar
2018-05-18 13:42     ` Masami Hiramatsu
2018-05-16 23:59 ` [PATCH -tip v3 6/7] bpf: error-inject: x86: Fix unbalanced preempt-count for function override Masami Hiramatsu
2018-05-17  0:00 ` [PATCH -tip v3 7/7] x86: kprobes: Do not disable preempt on int3 path Masami Hiramatsu
2018-05-18  6:23 ` [PATCH -tip v3 0/7] kprobes: x86: Cleanup jprobe implementation on x86 Ingo Molnar
2018-05-18 14:10   ` Masami Hiramatsu

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