linux-kernel - Re: linux-next: build warnings after merge of the tip tree

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Date:   Tue, 22 Mar 2022 09:22:55 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        ast@...nel.org, hjl.tools@...il.com, rick.p.edgecombe@...el.com,
        rppt@...nel.org, linux-toolchains@...r.kernel.org,
        Andrew.Cooper3@...rix.com, ndesaulniers@...gle.com
Subject: Re: linux-next: build warnings after merge of the tip tree

On Tue, 22 Mar 2022 21:46:29 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> > > Indeed. I would like to replace the trampoline code of kretprobe with
> > > rethook, eventually. There is no reason why we keep the clone.
> > > (But I need more arch maintainers help for that, there are too many
> > >  archs implemented kretprobes)  
> > 
> > CONFIG_KPROBE_ON_RETHOOK - and then implement archs one by one?  
> 
> Sounds good! Maybe we will see different data structure fields
> which depends on that config, but those are internal fields, so
> user will not access it.

Which is basically what I do for ftrace. Which is why we have all these:

        select HAVE_DYNAMIC_FTRACE
        select HAVE_DYNAMIC_FTRACE_WITH_REGS
        select HAVE_DYNAMIC_FTRACE_WITH_ARGS
        select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
        select HAVE_SAMPLE_FTRACE_DIRECT
        select HAVE_SAMPLE_FTRACE_DIRECT_MULTI

in the architecture Kconfigs.

-- Steve