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From:   Jiri Olsa <jolsa@kernel.org>
To:     Arnaldo Carvalho de Melo <acme@kernel.org>
Cc:     Ian Rogers <irogers@google.com>,
        lkml <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Ingo Molnar <mingo@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Michael Petlan <mpetlan@redhat.com>,
        Stephane Eranian <eranian@google.com>
Subject: [PATCH 1/9] perf tools: Use build_id object in dso
Date:   Tue, 13 Oct 2020 21:24:33 +0200
Message-Id: <20201013192441.1299447-2-jolsa@kernel.org>
In-Reply-To: <20201013192441.1299447-1-jolsa@kernel.org>
References: <20201013192441.1299447-1-jolsa@kernel.org>
MIME-Version: 1.0
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Precedence: bulk

Replace build_id byte array with struct build_id
object and all the code that references it.

The objective is to carry size together with build
id array, so it's better to keep both together.

This is preparatory change for following patches,
and there's no functional change.

Acked-by: Ian Rogers <irogers@google.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/bench/inject-buildid.c              |  4 ++--
 tools/perf/builtin-buildid-cache.c             |  2 +-
 tools/perf/builtin-inject.c                    |  4 ++--
 tools/perf/util/annotate.c                     |  4 ++--
 tools/perf/util/build-id.c                     |  6 +++---
 tools/perf/util/build-id.h                     |  5 +++++
 tools/perf/util/dso.c                          | 18 +++++++++---------
 tools/perf/util/dso.h                          |  2 +-
 tools/perf/util/dsos.c                         |  4 ++--
 tools/perf/util/header.c                       |  2 +-
 tools/perf/util/map.c                          |  4 ++--
 tools/perf/util/probe-event.c                  |  2 +-
 .../scripting-engines/trace-event-python.c     |  2 +-
 tools/perf/util/symbol.c                       |  2 +-
 tools/perf/util/synthetic-events.c             |  2 +-
 15 files changed, 34 insertions(+), 29 deletions(-)

diff --git a/tools/perf/bench/inject-buildid.c b/tools/perf/bench/inject-buildid.c
index e9a11f4a1109..3d048a8139a7 100644
--- a/tools/perf/bench/inject-buildid.c
+++ b/tools/perf/bench/inject-buildid.c
@@ -79,12 +79,12 @@ static int add_dso(const char *fpath, const struct stat *sb __maybe_unused,
 		   int typeflag, struct FTW *ftwbuf __maybe_unused)
 {
 	struct bench_dso *dso = &dsos[nr_dsos];
-	unsigned char build_id[BUILD_ID_SIZE];
+	struct build_id bid;
 
 	if (typeflag == FTW_D || typeflag == FTW_SL)
 		return 0;
 
-	if (filename__read_build_id(fpath, build_id, BUILD_ID_SIZE) < 0)
+	if (filename__read_build_id(fpath, bid.data, sizeof(bid.data)) < 0)
 		return 0;
 
 	dso->name = realpath(fpath, NULL);
diff --git a/tools/perf/builtin-buildid-cache.c b/tools/perf/builtin-buildid-cache.c
index 39efa51d7fb3..a523c629f321 100644
--- a/tools/perf/builtin-buildid-cache.c
+++ b/tools/perf/builtin-buildid-cache.c
@@ -284,7 +284,7 @@ static bool dso__missing_buildid_cache(struct dso *dso, int parm __maybe_unused)
 
 		pr_warning("Problems with %s file, consider removing it from the cache\n",
 			   filename);
-	} else if (memcmp(dso->build_id, build_id, sizeof(dso->build_id))) {
+	} else if (memcmp(dso->bid.data, build_id, sizeof(dso->bid.data))) {
 		pr_warning("Problems with %s file, consider removing it from the cache\n",
 			   filename);
 	}
diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index f3f965157d69..a35cdabe5bd4 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -522,8 +522,8 @@ static int dso__read_build_id(struct dso *dso)
 		return 0;
 
 	nsinfo__mountns_enter(dso->nsinfo, &nsc);
-	if (filename__read_build_id(dso->long_name, dso->build_id,
-				    sizeof(dso->build_id)) > 0) {
+	if (filename__read_build_id(dso->long_name, dso->bid.data,
+				    sizeof(dso->bid.data)) > 0) {
 		dso->has_build_id = true;
 	}
 	nsinfo__mountns_exit(&nsc);
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index fc17af7ba845..a016e1bd7b8d 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1578,8 +1578,8 @@ int symbol__strerror_disassemble(struct map_symbol *ms, int errnum, char *buf, s
 		char *build_id_msg = NULL;
 
 		if (dso->has_build_id) {
-			build_id__sprintf(dso->build_id,
-					  sizeof(dso->build_id), bf + 15);
+			build_id__sprintf(dso->bid.data,
+					  sizeof(dso->bid.data), bf + 15);
 			build_id_msg = bf;
 		}
 		scnprintf(buf, buflen,
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 31207b6e2066..7da13ddb0d50 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -272,7 +272,7 @@ char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size,
 	if (!dso->has_build_id)
 		return NULL;
 
-	build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
+	build_id__sprintf(dso->bid.data, sizeof(dso->bid.data), sbuild_id);
 	linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
 	if (!linkname)
 		return NULL;
@@ -355,7 +355,7 @@ static int machine__write_buildid_table(struct machine *machine,
 		in_kernel = pos->kernel ||
 				is_kernel_module(name,
 					PERF_RECORD_MISC_CPUMODE_UNKNOWN);
-		err = write_buildid(name, name_len, pos->build_id, machine->pid,
+		err = write_buildid(name, name_len, pos->bid.data, machine->pid,
 				    in_kernel ? kmisc : umisc, fd);
 		if (err)
 			break;
@@ -841,7 +841,7 @@ static int dso__cache_build_id(struct dso *dso, struct machine *machine)
 		is_kallsyms = true;
 		name = machine->mmap_name;
 	}
-	return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
+	return build_id_cache__add_b(dso->bid.data, sizeof(dso->bid.data), name,
 				     dso->nsinfo, is_kallsyms, is_vdso);
 }
 
diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h
index 949f7e54c9cb..5033e96d5c9d 100644
--- a/tools/perf/util/build-id.h
+++ b/tools/perf/util/build-id.h
@@ -8,6 +8,11 @@
 #include "tool.h"
 #include <linux/types.h>
 
+struct build_id {
+	u8	data[BUILD_ID_SIZE];
+	size_t	size;
+};
+
 struct nsinfo;
 
 extern struct perf_tool build_id__mark_dso_hit_ops;
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 5a3b4755f0b3..d2c1ed08c879 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -172,8 +172,8 @@ int dso__read_binary_type_filename(const struct dso *dso,
 			break;
 		}
 
-		build_id__sprintf(dso->build_id,
-				  sizeof(dso->build_id),
+		build_id__sprintf(dso->bid.data,
+				  sizeof(dso->bid.data),
 				  build_id_hex);
 		len = __symbol__join_symfs(filename, size, "/usr/lib/debug/.build-id/");
 		snprintf(filename + len, size - len, "%.2s/%s.debug",
@@ -1330,13 +1330,13 @@ void dso__put(struct dso *dso)
 
 void dso__set_build_id(struct dso *dso, void *build_id)
 {
-	memcpy(dso->build_id, build_id, sizeof(dso->build_id));
+	memcpy(dso->bid.data, build_id, sizeof(dso->bid.data));
 	dso->has_build_id = 1;
 }
 
 bool dso__build_id_equal(const struct dso *dso, u8 *build_id)
 {
-	return memcmp(dso->build_id, build_id, sizeof(dso->build_id)) == 0;
+	return memcmp(dso->bid.data, build_id, sizeof(dso->bid.data)) == 0;
 }
 
 void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
@@ -1346,8 +1346,8 @@ void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
 	if (machine__is_default_guest(machine))
 		return;
 	sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
-	if (sysfs__read_build_id(path, dso->build_id,
-				 sizeof(dso->build_id)) == 0)
+	if (sysfs__read_build_id(path, dso->bid.data,
+				 sizeof(dso->bid.data)) == 0)
 		dso->has_build_id = true;
 }
 
@@ -1365,8 +1365,8 @@ int dso__kernel_module_get_build_id(struct dso *dso,
 		 "%s/sys/module/%.*s/notes/.note.gnu.build-id",
 		 root_dir, (int)strlen(name) - 1, name);
 
-	if (sysfs__read_build_id(filename, dso->build_id,
-				 sizeof(dso->build_id)) == 0)
+	if (sysfs__read_build_id(filename, dso->bid.data,
+				 sizeof(dso->bid.data)) == 0)
 		dso->has_build_id = true;
 
 	return 0;
@@ -1376,7 +1376,7 @@ size_t dso__fprintf_buildid(struct dso *dso, FILE *fp)
 {
 	char sbuild_id[SBUILD_ID_SIZE];
 
-	build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
+	build_id__sprintf(dso->bid.data, sizeof(dso->bid.data), sbuild_id);
 	return fprintf(fp, "%s", sbuild_id);
 }
 
diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
index 8ad17f395a19..eac004210b47 100644
--- a/tools/perf/util/dso.h
+++ b/tools/perf/util/dso.h
@@ -176,7 +176,7 @@ struct dso {
 	bool		 sorted_by_name;
 	bool		 loaded;
 	u8		 rel;
-	u8		 build_id[BUILD_ID_SIZE];
+	struct build_id	 bid;
 	u64		 text_offset;
 	const char	 *short_name;
 	const char	 *long_name;
diff --git a/tools/perf/util/dsos.c b/tools/perf/util/dsos.c
index 939471731ea6..e3af46e818f1 100644
--- a/tools/perf/util/dsos.c
+++ b/tools/perf/util/dsos.c
@@ -73,8 +73,8 @@ bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
 			continue;
 		}
 		nsinfo__mountns_enter(pos->nsinfo, &nsc);
-		if (filename__read_build_id(pos->long_name, pos->build_id,
-					    sizeof(pos->build_id)) > 0) {
+		if (filename__read_build_id(pos->long_name, pos->bid.data,
+					    sizeof(pos->bid.data)) > 0) {
 			have_build_id	  = true;
 			pos->has_build_id = true;
 		}
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 9cf4efdcbbbd..cde8f6eba479 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2095,7 +2095,7 @@ static int __event_process_build_id(struct perf_record_header_build_id *bev,
 			free(m.name);
 		}
 
-		build_id__sprintf(dso->build_id, sizeof(dso->build_id),
+		build_id__sprintf(dso->bid.data, sizeof(dso->bid.data),
 				  sbuild_id);
 		pr_debug("build id event received for %s: %s\n",
 			 dso->long_name, sbuild_id);
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 8b305e624124..522df3090b1c 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -331,8 +331,8 @@ int map__load(struct map *map)
 		if (map->dso->has_build_id) {
 			char sbuild_id[SBUILD_ID_SIZE];
 
-			build_id__sprintf(map->dso->build_id,
-					  sizeof(map->dso->build_id),
+			build_id__sprintf(map->dso->bid.data,
+					  sizeof(map->dso->bid.data),
 					  sbuild_id);
 			pr_debug("%s with build id %s not found", name, sbuild_id);
 		} else
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 3a1b58a92673..2041ad849851 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -473,7 +473,7 @@ static struct debuginfo *open_from_debuginfod(struct dso *dso, struct nsinfo *ns
 	if (!c)
 		return NULL;
 
-	build_id__sprintf(dso->build_id, BUILD_ID_SIZE, sbuild_id);
+	build_id__sprintf(dso->bid.data, BUILD_ID_SIZE, sbuild_id);
 	fd = debuginfod_find_debuginfo(c, (const unsigned char *)sbuild_id,
 					0, &path);
 	if (fd >= 0)
diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index 739516fdf6e3..db3b1c275d8f 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -1064,7 +1064,7 @@ static int python_export_dso(struct db_export *dbe, struct dso *dso,
 	char sbuild_id[SBUILD_ID_SIZE];
 	PyObject *t;
 
-	build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
+	build_id__sprintf(dso->bid.data, sizeof(dso->bid.data), sbuild_id);
 
 	t = tuple_new(5);
 
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 5ddf76fb691c..c772c8c70db5 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -2153,7 +2153,7 @@ static char *dso__find_kallsyms(struct dso *dso, struct map *map)
 			goto proc_kallsyms;
 	}
 
-	build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
+	build_id__sprintf(dso->bid.data, sizeof(dso->bid.data), sbuild_id);
 
 	/* Find kallsyms in build-id cache with kcore */
 	scnprintf(path, sizeof(path), "%s/%s/%s",
diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index 3ca5d9399680..8a23391558cf 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -1961,7 +1961,7 @@ int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16
 
 	len = pos->long_name_len + 1;
 	len = PERF_ALIGN(len, NAME_ALIGN);
-	memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
+	memcpy(&ev.build_id.build_id, pos->bid.data, sizeof(pos->bid.data));
 	ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
 	ev.build_id.header.misc = misc;
 	ev.build_id.pid = machine->pid;
-- 
2.26.2