linux-kernel - Re: [PATCH v1 11/11] perf build: Rename PERF_HAVE_DWARF_REGS to PERF_HAVE_LIBDW

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Message-ID: <CAP-5=fVQVEgSK55Y_38KXyp3CJ1ssPOcqkA2JKwMDVYJe8iztA@mail.gmail.com>
Date: Thu, 26 Sep 2024 05:47:16 -0700
From: Ian Rogers <irogers@...gle.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Kan Liang <kan.liang@...ux.intel.com>, 
	John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>, 
	James Clark <james.clark@...aro.org>, Mike Leach <mike.leach@...aro.org>, 
	Leo Yan <leo.yan@...ux.dev>, Guo Ren <guoren@...nel.org>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Nick Terrell <terrelln@...com>, 
	Guilherme Amadio <amadio@...too.org>, Changbin Du <changbin.du@...wei.com>, 
	"Steinar H. Gunderson" <sesse@...gle.com>, "Masami Hiramatsu (Google)" <mhiramat@...nel.org>, 
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	Anup Patel <anup@...infault.org>, Shenlin Liang <liangshenlin@...incomputing.com>, 
	Atish Patra <atishp@...osinc.com>, Oliver Upton <oliver.upton@...ux.dev>, 
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	Alexander Lobakin <aleksander.lobakin@...el.com>, "David S. Miller" <davem@...emloft.net>, 
	Przemek Kitszel <przemyslaw.kitszel@...el.com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, Yang Jihong <yangjihong@...edance.com>
Subject: Re: [PATCH v1 11/11] perf build: Rename PERF_HAVE_DWARF_REGS to PERF_HAVE_LIBDW_REGS

On Wed, Sep 25, 2024 at 8:27 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> On Tue, Sep 24, 2024 at 09:04:18AM -0700, Ian Rogers wrote:
> > The name dwarf can imply libunwind support, whereas
> > PERF_HAVE_DWARF_REGS is only enabled with libdw support. Rename to
> > make it clearer there is a libdw connection.
>
> While it only covers libdw, I think the idea of this macro is whether
> the arch has register mappings defined in DWARF standard.  So I think
> it's better to keep the name for this case.

How can the dwarf standard exist for an arch but not define registers?

Thanks,
Ian