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Message-Id: <20241007171942.e96d5c520e065bbe4cf8ae5f@kernel.org>
Date: Mon, 7 Oct 2024 17:19:42 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim
<namhyung@...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>, "Steven Rostedt (Google)" <rostedt@...dmis.org>,
Guilherme Amadio <amadio@...too.org>, Changbin Du <changbin.du@...wei.com>,
Daniel Bristot de Oliveira <bristot@...nel.org>, Daniel Wagner
<dwagner@...e.de>, Aditya Gupta <adityag@...ux.ibm.com>, Athira Rajeev
<atrajeev@...ux.vnet.ibm.com>, Masahiro Yamada <masahiroy@...nel.org>,
Kajol Jain <kjain@...ux.ibm.com>, Huacai Chen <chenhuacai@...nel.org>, Bibo
Mao <maobibo@...ngson.cn>, Anup Patel <anup@...infault.org>, Atish Patra
<atishp@...osinc.com>, Shenlin Liang <liangshenlin@...incomputing.com>,
Oliver Upton <oliver.upton@...ux.dev>, "Steinar H. Gunderson"
<sesse@...gle.com>, "Dr. David Alan Gilbert" <linux@...blig.org>, Chen Pei
<cp0613@...ux.alibaba.com>, Dima Kogan <dima@...retsauce.net>, Yury Norov
<yury.norov@...il.com>, Alexander Lobakin <aleksander.lobakin@...el.com>,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 19/31] perf arm64: Remove dwarf-regs.c
On Sat, 5 Oct 2024 12:55:29 -0700
Ian Rogers <irogers@...gle.com> wrote:
> The file just provides the function get_arch_regstr, however, if in
> the only caller get_dwarf_regstr EM_HOST is used for the EM_NONE case
> the function can never be called. So remove as dead code. Tidy up the
> EM_NONE cases for arm64 in dwarf-regs.c.
OK, this seems just a redundant information in
tools/perf/arch/arm64/include/dwarf-regs-table.h (there is alredy
register number -> name mapping table.)
Looks good to me.
Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Thank you,
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
> tools/perf/arch/arm64/util/Build | 1 -
> tools/perf/arch/arm64/util/dwarf-regs.c | 80 -------------------------
> tools/perf/util/dwarf-regs.c | 4 +-
> tools/perf/util/include/dwarf-regs.h | 2 +-
> 4 files changed, 3 insertions(+), 84 deletions(-)
> delete mode 100644 tools/perf/arch/arm64/util/dwarf-regs.c
>
> diff --git a/tools/perf/arch/arm64/util/Build b/tools/perf/arch/arm64/util/Build
> index 4387a6d6a6c3..a74521b79eaa 100644
> --- a/tools/perf/arch/arm64/util/Build
> +++ b/tools/perf/arch/arm64/util/Build
> @@ -4,7 +4,6 @@ perf-util-y += perf_regs.o
> perf-util-y += tsc.o
> perf-util-y += pmu.o
> perf-util-$(CONFIG_LIBTRACEEVENT) += kvm-stat.o
> -perf-util-$(CONFIG_LIBDW) += dwarf-regs.o
> perf-util-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o
> perf-util-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
>
> diff --git a/tools/perf/arch/arm64/util/dwarf-regs.c b/tools/perf/arch/arm64/util/dwarf-regs.c
> deleted file mode 100644
> index 343a62fa4199..000000000000
> --- a/tools/perf/arch/arm64/util/dwarf-regs.c
> +++ /dev/null
> @@ -1,80 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0-only
> -/*
> - * Mapping of DWARF debug register numbers into register names.
> - *
> - * Copyright (C) 2010 Will Deacon, ARM Ltd.
> - */
> -
> -#include <errno.h>
> -#include <stddef.h>
> -#include <string.h>
> -#include <dwarf-regs.h>
> -#include <linux/stringify.h>
> -
> -struct regs_dwarfnum {
> - const char *name;
> - unsigned int dwarfnum;
> -};
> -
> -#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
> -#define GPR_DWARFNUM_NAME(num) \
> - {.name = __stringify(%x##num), .dwarfnum = num}
> -#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
> -
> -/*
> - * Reference:
> - * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf
> - */
> -static const struct regs_dwarfnum regdwarfnum_table[] = {
> - GPR_DWARFNUM_NAME(0),
> - GPR_DWARFNUM_NAME(1),
> - GPR_DWARFNUM_NAME(2),
> - GPR_DWARFNUM_NAME(3),
> - GPR_DWARFNUM_NAME(4),
> - GPR_DWARFNUM_NAME(5),
> - GPR_DWARFNUM_NAME(6),
> - GPR_DWARFNUM_NAME(7),
> - GPR_DWARFNUM_NAME(8),
> - GPR_DWARFNUM_NAME(9),
> - GPR_DWARFNUM_NAME(10),
> - GPR_DWARFNUM_NAME(11),
> - GPR_DWARFNUM_NAME(12),
> - GPR_DWARFNUM_NAME(13),
> - GPR_DWARFNUM_NAME(14),
> - GPR_DWARFNUM_NAME(15),
> - GPR_DWARFNUM_NAME(16),
> - GPR_DWARFNUM_NAME(17),
> - GPR_DWARFNUM_NAME(18),
> - GPR_DWARFNUM_NAME(19),
> - GPR_DWARFNUM_NAME(20),
> - GPR_DWARFNUM_NAME(21),
> - GPR_DWARFNUM_NAME(22),
> - GPR_DWARFNUM_NAME(23),
> - GPR_DWARFNUM_NAME(24),
> - GPR_DWARFNUM_NAME(25),
> - GPR_DWARFNUM_NAME(26),
> - GPR_DWARFNUM_NAME(27),
> - GPR_DWARFNUM_NAME(28),
> - GPR_DWARFNUM_NAME(29),
> - REG_DWARFNUM_NAME("%lr", 30),
> - REG_DWARFNUM_NAME("%sp", 31),
> - REG_DWARFNUM_END,
> -};
> -
> -/**
> - * get_arch_regstr() - lookup register name from it's DWARF register number
> - * @n: the DWARF register number
> - *
> - * get_arch_regstr() returns the name of the register in struct
> - * regdwarfnum_table from it's DWARF register number. If the register is not
> - * found in the table, this returns NULL;
> - */
> -const char *get_arch_regstr(unsigned int n)
> -{
> - const struct regs_dwarfnum *roff;
> -
> - for (roff = regdwarfnum_table; roff->name != NULL; roff++)
> - if (roff->dwarfnum == n)
> - return roff->name;
> - return NULL;
> -}
> diff --git a/tools/perf/util/dwarf-regs.c b/tools/perf/util/dwarf-regs.c
> index eac99a246737..18e916c8e993 100644
> --- a/tools/perf/util/dwarf-regs.c
> +++ b/tools/perf/util/dwarf-regs.c
> @@ -32,14 +32,14 @@
> const char *get_dwarf_regstr(unsigned int n, unsigned int machine,
> unsigned int flags __maybe_unused)
> {
> -#if EM_HOST == EM_X86_64 || EM_HOST == EM_386
> +#if EM_HOST == EM_X86_64 || EM_HOST == EM_386 || EM_HOST == EM_AARCH64
> if (machine == EM_NONE) {
> /* Generic arch - use host arch */
> machine = EM_HOST;
> }
> #endif
> switch (machine) {
> -#if EM_HOST != EM_X86_64 && EM_HOST != EM_386
> +#if EM_HOST != EM_X86_64 && EM_HOST != EM_386 && EM_HOST != EM_AARCH64
> case EM_NONE: /* Generic arch - use host arch */
> return get_arch_regstr(n);
> #endif
> diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
> index 062623aefd5a..e640657f69c8 100644
> --- a/tools/perf/util/include/dwarf-regs.h
> +++ b/tools/perf/util/include/dwarf-regs.h
> @@ -79,7 +79,7 @@
> #define DWARF_REG_FB 0xd3affb /* random number */
>
> #ifdef HAVE_LIBDW_SUPPORT
> -#if !defined(__x86_64__) && !defined(__i386__)
> +#if !defined(__x86_64__) && !defined(__i386__) && !defined(__aarch64__)
> const char *get_arch_regstr(unsigned int n);
> #endif
>
> --
> 2.47.0.rc0.187.ge670bccf7e-goog
>
--
Masami Hiramatsu (Google) <mhiramat@...nel.org>
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