linux-kernel - [PATCH v2 1/2] perf env: Normalize aarch64.* and arm64.* to arm64 in normalize

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Date:   Mon, 26 Jul 2021 20:38:53 +0800
From:   Li Huafei <lihuafei1@...wei.com>
To:     <acme@...nel.org>, <james.clark@....com>, <jolsa@...nel.org>
CC:     <peterz@...radead.org>, <mark.rutland@....com>, <mingo@...hat.com>,
        <alexander.shishkin@...ux.intel.com>, <namhyung@...nel.org>,
        <mliska@...e.cz>, <irogers@...gle.com>, <dzhu@...ecomp.com>,
        <rickyman7@...il.com>, <yao.jin@...ux.intel.com>,
        <linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <zhangjinhao2@...wei.com>
Subject: [PATCH v2 1/2] perf env: Normalize aarch64.* and arm64.* to arm64 in normalize_arch()

On my aarch64 big endian machine, the perf annotate does not work.

 # perf annotate
  Percent |      Source code & Disassembly of [kernel.kallsyms] for cycles (253 samples, percent: local period)
 --------------------------------------------------------------------------------------------------------------
  Percent |      Source code & Disassembly of [kernel.kallsyms] for cycles (1 samples, percent: local period)
 ------------------------------------------------------------------------------------------------------------
  Percent |      Source code & Disassembly of [kernel.kallsyms] for cycles (47 samples, percent: local period)
 -------------------------------------------------------------------------------------------------------------
 ...

This is because the arch_find() function uses the normalized architecture
name provided by normalize_arch(), and my machine's architecture name
aarch64_be is not normalized to arm64.  Like other architectures such as
arm and powerpc, we can fuzzy match the architecture names associated with
aarch64.* and normalize them.

It seems that there is also arm64_be architecture name, which we also
normalize to arm64.

Signed-off-by: Li Huafei <lihuafei1@...wei.com>
---
Changes in v2:
 - The error log added in symbol__annotate() is put into a single patch
 - Remove the "Fixes" tag
 - According to James' suggestion, "arm64_be" is also normalized to
   "arm64"

 tools/perf/util/env.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index cec2e6cad8aa..ab341050be46 100644
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -349,7 +349,7 @@ static const char *normalize_arch(char *arch)
 		return "x86";
 	if (!strcmp(arch, "sun4u") || !strncmp(arch, "sparc", 5))
 		return "sparc";
-	if (!strcmp(arch, "aarch64") || !strcmp(arch, "arm64"))
+	if (!strncmp(arch, "aarch64", 7) || !strncmp(arch, "arm64", 5))
 		return "arm64";
 	if (!strncmp(arch, "arm", 3) || !strcmp(arch, "sa110"))
 		return "arm";
-- 
2.17.1