Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Fri, 11 Oct 2019 15:45:36 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Steven Rostedt <rostedt@goodmis.org>
Cc:     x86@kernel.org, linux-kernel@vger.kernel.org, mhiramat@kernel.org,
        bristot@redhat.com, jbaron@akamai.com,
        torvalds@linux-foundation.org, tglx@linutronix.de,
        mingo@kernel.org, namit@vmware.com, hpa@zytor.com, luto@kernel.org,
        ard.biesheuvel@linaro.org, jpoimboe@redhat.com, jeyu@kernel.org
Subject: Re: [PATCH v3 5/6] x86/ftrace: Use text_poke()
Message-ID: <20191011134535.GZ2328@hirez.programming.kicks-ass.net>
References: <20191007081945.10951536.8@infradead.org>
 <20191008104335.6fcd78c9@gandalf.local.home>
 <20191009224135.2dcf7767@oasis.local.home>
 <20191010092054.GR2311@hirez.programming.kicks-ass.net>
 <20191010091956.48fbcf42@gandalf.local.home>
 <20191010140513.GT2311@hirez.programming.kicks-ass.net>
 <20191010115449.22044b53@gandalf.local.home>
 <20191010172819.GS2328@hirez.programming.kicks-ass.net>
 <20191011125903.GN2359@hirez.programming.kicks-ass.net>
 <20191011093319.3ef302ff@gandalf.local.home>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20191011093319.3ef302ff@gandalf.local.home>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Fri, Oct 11, 2019 at 09:33:19AM -0400, Steven Rostedt wrote:
> On Fri, 11 Oct 2019 14:59:03 +0200
> Peter Zijlstra <peterz@infradead.org> wrote:
> 
> > On Thu, Oct 10, 2019 at 07:28:19PM +0200, Peter Zijlstra wrote:
> > 
> > > Really the best solution is to move all the poking into
> > > ftrace_module_init(), before we mark it RO+X. That's what I'm going to
> > > do for jump_label and static_call as well, I just need to add that extra
> > > notifier callback.  
> > 
> > OK, so I started writing that patch... or rather, I wrote the patch and
> > started on the Changelog when I ran into trouble describing why we need
> > it.
> > 
> > That is, I'm struggling to explain why we cannot flip
> > prepare_coming_module() and complete_formation().
> > 
> > Yes, it breaks ftrace, but I'm thinking that is all it breaks. So let me
> > see if we can cure that.
> 
> For someone that doesn't use modules, you are making me very nervous
> with all the changes you are making to the module code! ;-)

Hey, today I build a kernel with modules just for you :-)

And whatever it takes right, I just want to clean this crap up.