linux-kernel - Re: [PATCH v2 2/5] objtool: Fix ORC unwinding in non-JIT BPF generated code

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Message-ID: <20190615000242.e5tcogffvyuuhnrs@treble>
Date:   Fri, 14 Jun 2019 19:02:42 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     X86 ML <x86@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, Peter Zijlstra <peterz@...radead.org>,
        Song Liu <songliubraving@...com>,
        Kairui Song <kasong@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        David Laight <David.Laight@...lab.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v2 2/5] objtool: Fix ORC unwinding in non-JIT BPF
 generated code

On Fri, Jun 14, 2019 at 04:30:15PM -0700, Alexei Starovoitov wrote:
> On Fri, Jun 14, 2019 at 4:17 PM Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> >
> > On Fri, Jun 14, 2019 at 02:22:59PM -0700, Alexei Starovoitov wrote:
> > > On Fri, Jun 14, 2019 at 2:19 PM Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> > > > > > > >
> > > > > > > > +#define JUMP_TABLE_SYM_PREFIX "jump_table."
> > > > > > >
> > > > > > > since external tool will be looking at it should it be named
> > > > > > > "bpf_jump_table." to avoid potential name conflicts?
> > > > > > > Or even more unique name?
> > > > > > > Like "bpf_interpreter_jump_table." ?
> > > > > >
> > > > > > No, the point is that it's a generic feature which can also be used any
> > > > > > non-BPF code which might also have a jump table.
> > > > >
> > > > > and you're proposing to name all such jump tables in the kernel
> > > > > as static foo jump_table[] ?
> > > >
> > > > That's the idea.
> > >
> > > Then it needs much wider discussion.
> >
> > Why would it need wider discussion?  It only has one user.  If you
> > honestly believe that it will be controversial to require future users
> > to call a static jump table "jump_table" then we can have that
> > discussion when it comes up.
> 
> It's clearly controversial.
> I nacked it already on pointless name change
> from "jumptable" to "jump_table" and now you're saying
> that no one will complain about "jump_table" name
> for all jump tables in the kernel that will ever appear?

Let me get this straight.  You're saying that "jumptable" and
"bpf_interpreter_jump_table" are both acceptable.

But NACK to "jump_table".

Ok...

-- 
Josh