linux-kernel - Re: [PATCH bpf-next v2 0/4] kprobes: rethook: x86: Replace kretprobe trampoline with rethook

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Date:   Fri, 25 Mar 2022 17:51:19 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        kernel-janitors@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Jiri Olsa <jolsa@...nel.org>, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v2 0/4] kprobes: rethook: x86: Replace kretprobe
 trampoline with rethook

On Fri, Mar 25, 2022 at 03:43:15PM +0100, Peter Zijlstra wrote:
> On Fri, Mar 25, 2022 at 11:22:53PM +0900, Masami Hiramatsu wrote:
> 
> > Masami Hiramatsu (3):
> >       kprobes: Use rethook for kretprobe if possible
> >       rethook: kprobes: x86: Replace kretprobe with rethook on x86
> >       x86,kprobes: Fix optprobe trampoline to generate complete pt_regs
> > 
> > Peter Zijlstra (1):
> >       Subject: x86,rethook: Fix arch_rethook_trampoline() to generate a complete pt_regs
> 
> You fat-fingered the subject there ^
> 
> Other than that:
> 
> Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> 
> Hopefully the ftrace return trampoline can also be switched over..

Urgh, allnoconfig doesn't build because..

diff --git a/kernel/Makefile b/kernel/Makefile
index 56f4ee97f328..471d71935e90 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -108,6 +108,7 @@ obj-$(CONFIG_TRACING) += trace/
 obj-$(CONFIG_TRACE_CLOCK) += trace/
 obj-$(CONFIG_RING_BUFFER) += trace/
 obj-$(CONFIG_TRACEPOINTS) += trace/
+obj-$(CONFIG_RETHOOK) += trace/
 obj-$(CONFIG_IRQ_WORK) += irq_work.o
 obj-$(CONFIG_CPU_PM) += cpu_pm.o
 obj-$(CONFIG_BPF) += bpf/