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From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: X86 ML <x86@kernel.org>, Alexei Starovoitov <ast@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Network Development <netdev@vger.kernel.org>,
	bpf <bpf@vger.kernel.org>, Peter Zijlstra <peterz@infradead.org>,
	Song Liu <songliubraving@fb.com>, Kairui Song <kasong@redhat.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	David Laight <David.Laight@aculab.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH v2 2/5] objtool: Fix ORC unwinding in non-JIT BPF generated code
Date: Fri, 14 Jun 2019 17:07:48 -0700
Message-ID: <CAADnVQ+jhza8bsBNAdayk=tcXN4nJt+fVAxtoVZNDPbVPveR8A@mail.gmail.com> (raw)
In-Reply-To: <20190615000242.e5tcogffvyuuhnrs@treble>

On Fri, Jun 14, 2019 at 5:02 PM Josh Poimboeuf <jpoimboe@redhat.com> wrote:
>
> 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@redhat.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@redhat.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...

Correct. I think I explained the reasons behind, right?

  parent reply index

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-14 17:56 [PATCH v2 0/5] x86/bpf: unwinder fixes Josh Poimboeuf
2019-06-14 17:56 ` [PATCH v2 1/5] perf/x86: Always store regs->ip in perf_callchain_kernel() Josh Poimboeuf
2019-06-14 20:56   ` Alexei Starovoitov
2019-06-14 21:06     ` Josh Poimboeuf
2019-06-14 21:16       ` Steven Rostedt
2019-06-14 21:20         ` Song Liu
2019-06-14 17:56 ` [PATCH v2 2/5] objtool: Fix ORC unwinding in non-JIT BPF generated code Josh Poimboeuf
2019-06-14 20:58   ` Alexei Starovoitov
2019-06-14 21:07     ` Josh Poimboeuf
2019-06-14 21:09       ` Alexei Starovoitov
2019-06-14 21:19         ` Josh Poimboeuf
2019-06-14 21:22           ` Alexei Starovoitov
2019-06-14 23:17             ` Josh Poimboeuf
2019-06-14 23:30               ` Alexei Starovoitov
2019-06-15  0:02                 ` Josh Poimboeuf
2019-06-15  0:06                   ` abhja kaanlani
2019-06-15  0:07                   ` Alexei Starovoitov [this message]
2019-06-17 14:57     ` David Laight
2019-06-14 17:56 ` [PATCH v2 3/5] x86/bpf: Move epilogue generation to a dedicated function Josh Poimboeuf
2019-06-14 17:56 ` [PATCH v2 4/5] x86/bpf: Fix 64-bit JIT frame pointer usage Josh Poimboeuf
2019-06-14 21:05   ` Alexei Starovoitov
2019-06-14 21:19     ` Josh Poimboeuf
2019-06-14 21:27       ` Alexei Starovoitov
2019-06-14 23:13         ` Josh Poimboeuf
2019-06-14 23:23           ` Alexei Starovoitov
2019-06-14 23:54             ` Josh Poimboeuf
2019-06-15  0:02               ` Alexei Starovoitov
2019-06-15  4:27                 ` Josh Poimboeuf
2019-06-15  5:16                   ` Alexei Starovoitov
2019-06-15 12:57                     ` Josh Poimboeuf
2019-06-14 17:56 ` [PATCH v2 5/5] x86/unwind/orc: Fall back to using frame pointers for generated code Josh Poimboeuf

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