linux-kernel - [PATCH] perf env: Normalize aarch64.* to arm64 in normalize

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Date:   Fri, 23 Jul 2021 09:49:44 +0800
From:   Li Huafei <lihuafei1@...wei.com>
To:     <jolsa@...nel.org>, <acme@...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] perf env: Normalize aarch64.* 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.

Fixes: c34df25b40c2 ("perf annotate: Add symbol__annotate function")
Signed-off-by: Li Huafei <lihuafei1@...wei.com>
---
 tools/perf/util/annotate.c | 4 +++-
 tools/perf/util/env.c      | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index aa04a3655236..cb280de3369f 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -2192,8 +2192,10 @@ int symbol__annotate(struct map_symbol *ms, struct evsel *evsel,
 		return errno;
 
 	args.arch = arch = arch__find(arch_name);
-	if (arch == NULL)
+	if (arch == NULL) {
+		pr_err("%s: unsupported arch %s\n", __func__, arch_name);
 		return ENOTSUP;
+	}
 
 	if (parch)
 		*parch = arch;
diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index cec2e6cad8aa..a91da1e9b201 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) || !strcmp(arch, "arm64"))
 		return "arm64";
 	if (!strncmp(arch, "arm", 3) || !strcmp(arch, "sa110"))
 		return "arm";
-- 
2.17.1