linux-kernel - [PATCH v1 10/23] perf dwarf-regs: Remove get_arch

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Message-ID: <20260117052849.2205545-11-irogers@google.com>
Date: Fri, 16 Jan 2026 21:28:36 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	James Clark <james.clark@...aro.org>, John Garry <john.g.garry@...cle.com>, 
	Will Deacon <will@...nel.org>, Leo Yan <leo.yan@...ux.dev>, Guo Ren <guoren@...nel.org>, 
	Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Alexandre Ghiti <alex@...ti.fr>, Shimin Guo <shimin.guo@...dio.com>, 
	Athira Rajeev <atrajeev@...ux.ibm.com>, Stephen Brennan <stephen.s.brennan@...cle.com>, 
	Howard Chu <howardchu95@...il.com>, Thomas Falcon <thomas.falcon@...el.com>, 
	Andi Kleen <ak@...ux.intel.com>, "Dr. David Alan Gilbert" <linux@...blig.org>, 
	Dmitry Vyukov <dvyukov@...gle.com>, 
	"Krzysztof Łopatowski" <krzysztof.m.lopatowski@...il.com>, Chun-Tse Shao <ctshao@...gle.com>, 
	Aditya Bodkhe <aditya.b1@...ux.ibm.com>, Haibo Xu <haibo1.xu@...el.com>, 
	Sergei Trofimovich <slyich@...il.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, 
	Mark Wielaard <mark@...mp.org>
Subject: [PATCH v1 10/23] perf dwarf-regs: Remove get_arch_regnum

Except in dwarf-regs the function is never called. The weak function
has no strong arch implementations. Remove so that the fall-through
case applies.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/dwarf-regs.c         | 12 ------------
 tools/perf/util/include/dwarf-regs.h |  4 ----
 2 files changed, 16 deletions(-)

diff --git a/tools/perf/util/dwarf-regs.c b/tools/perf/util/dwarf-regs.c
index 28a1cfdf26d4..b2f37299147e 100644
--- a/tools/perf/util/dwarf-regs.c
+++ b/tools/perf/util/dwarf-regs.c
@@ -71,13 +71,6 @@ const char *get_dwarf_regstr(unsigned int n, unsigned int machine, unsigned int
 	return NULL;
 }
 
-#if EM_HOST != EM_X86_64 && EM_HOST != EM_386
-__weak int get_arch_regnum(const char *name __maybe_unused)
-{
-	return -ENOTSUP;
-}
-#endif
-
 /* Return DWARF register number from architecture register name */
 int get_dwarf_regnum(const char *name, unsigned int machine, unsigned int flags __maybe_unused)
 {
@@ -98,11 +91,6 @@ int get_dwarf_regnum(const char *name, unsigned int machine, unsigned int flags
 		machine = EM_HOST;
 	}
 	switch (machine) {
-#if EM_HOST != EM_X86_64 && EM_HOST != EM_386
-	case EM_HOST:
-		reg = get_arch_regnum(regname);
-		break;
-#endif
 	case EM_X86_64:
 		fallthrough;
 	case EM_386:
diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
index 6f1b9f6b2466..015d1ade645f 100644
--- a/tools/perf/util/include/dwarf-regs.h
+++ b/tools/perf/util/include/dwarf-regs.h
@@ -101,10 +101,6 @@ const char *get_dwarf_regstr(unsigned int n, unsigned int machine, unsigned int
 
 int get_x86_regnum(const char *name);
 
-#if !defined(__x86_64__) && !defined(__i386__)
-int get_arch_regnum(const char *name);
-#endif
-
 /*
  * get_dwarf_regnum - Returns DWARF regnum from register name
  * name: architecture register name
-- 
2.52.0.457.g6b5491de43-goog