linux-kernel - Re: [PATCH 03/11] asm-generic: add generic dwarf definition

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Message-ID: <20190826222510.6m2k3puwflnr52b7@mail.google.com>
Date:   Tue, 27 Aug 2019 06:25:12 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Changbin Du <changbin.du@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Jonathan Corbet <corbet@....net>, Jessica Yu <jeyu@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH 03/11] asm-generic: add generic dwarf definition

Hi, Peter,

On Mon, Aug 26, 2019 at 09:42:15AM +0200, Peter Zijlstra wrote:
> On Sun, Aug 25, 2019 at 09:23:22PM +0800, Changbin Du wrote:
> > Add generic DWARF constant definitions. We will use it later.
> > 
> > Signed-off-by: Changbin Du <changbin.du@...il.com>
> > ---
> >  include/asm-generic/dwarf.h | 199 ++++++++++++++++++++++++++++++++++++
> >  1 file changed, 199 insertions(+)
> >  create mode 100644 include/asm-generic/dwarf.h
> > 
> > diff --git a/include/asm-generic/dwarf.h b/include/asm-generic/dwarf.h
> > new file mode 100644
> > index 000000000000..c705633c2a8f
> > --- /dev/null
> > +++ b/include/asm-generic/dwarf.h
> > @@ -0,0 +1,199 @@
> > +/* SPDX-License-Identifier: GPL-2.0
> > + *
> > + * Architecture independent definitions of DWARF.
> > + *
> > + * Copyright (C) 2019 Changbin Du <changbin.du@...il.com>
> 
> You're claiming copyright on dwarf definitions? ;-)
> 
> I'm thinking only Oracle was daft enough to think stuff like that was
> copyrightable.
> 
ok, let me remove copyright line. I think SPDX claim is okay, right?

> Also; I think it would be very good to not use/depend on DWARF for this.
>
It only includes the DWARF expersion opcodes, not all of dwarf stuffs.

> You really don't need all of DWARF; I'm thikning you only need a few
> types; for location we already have regs_get_kernel_argument() which
> has all the logic to find the n-th argument.
> 
regs_get_kernel_argument() can handle most cases, but if the size of one paramater
exceeds 64bit (it is rare in kernel), we must recalculate the locations. So I think
dwarf location descriptor is the most accurate one.

-- 
Cheers,
Changbin Du