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Subject[PATCH 4/9] perf tools: Pass build id object to sysfs__read_build_id
Date
Passing build id object to sysfs__read_build_id function,
so it can populate the size of the build_id object.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/util/build-id.c | 6 +++---
tools/perf/util/dso.c | 6 ++----
tools/perf/util/symbol-elf.c | 11 +++++------
tools/perf/util/symbol-minimal.c | 7 ++-----
tools/perf/util/symbol.c | 7 +++----
tools/perf/util/symbol.h | 2 +-
6 files changed, 16 insertions(+), 23 deletions(-)

diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 62b258aaa128..1c332e78bbc3 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -113,7 +113,7 @@ int build_id__sprintf(const u8 *build_id, int len, char *bf)
int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
{
char notes[PATH_MAX];
- u8 build_id[BUILD_ID_SIZE];
+ struct build_id bid;
int ret;

if (!root_dir)
@@ -121,11 +121,11 @@ int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)

scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);

- ret = sysfs__read_build_id(notes, build_id, sizeof(build_id));
+ ret = sysfs__read_build_id(notes, &bid);
if (ret < 0)
return ret;

- return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
+ return build_id__sprintf(bid.data, sizeof(bid.data), sbuild_id);
}

int filename__sprintf_build_id(const char *pathname, char *sbuild_id)
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index d2c1ed08c879..e87fa9a71d9f 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -1346,8 +1346,7 @@ 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->bid.data,
- sizeof(dso->bid.data)) == 0)
+ if (sysfs__read_build_id(path, &dso->bid) == 0)
dso->has_build_id = true;
}

@@ -1365,8 +1364,7 @@ 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->bid.data,
- sizeof(dso->bid.data)) == 0)
+ if (sysfs__read_build_id(filename, &dso->bid) == 0)
dso->has_build_id = true;

return 0;
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 61d7c444e6f5..97a55f162ea5 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -595,13 +595,11 @@ int filename__read_build_id(const char *filename, struct build_id *bid)

#endif // HAVE_LIBBFD_BUILDID_SUPPORT

-int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
+int sysfs__read_build_id(const char *filename, struct build_id *bid)
{
+ size_t size = sizeof(bid->data);
int fd, err = -1;

- if (size < BUILD_ID_SIZE)
- goto out;
-
fd = open(filename, O_RDONLY);
if (fd < 0)
goto out;
@@ -622,8 +620,9 @@ int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
break;
if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
size_t sz = min(descsz, size);
- if (read(fd, build_id, sz) == (ssize_t)sz) {
- memset(build_id + sz, 0, size - sz);
+ if (read(fd, bid->data, sz) == (ssize_t)sz) {
+ memset(bid->data + sz, 0, size - sz);
+ bid->size = sz;
err = 0;
break;
}
diff --git a/tools/perf/util/symbol-minimal.c b/tools/perf/util/symbol-minimal.c
index 5173331ee6e4..dba6b9e5d64e 100644
--- a/tools/perf/util/symbol-minimal.c
+++ b/tools/perf/util/symbol-minimal.c
@@ -222,9 +222,8 @@ int filename__read_build_id(const char *filename, struct build_id *bid)
return ret;
}

-int sysfs__read_build_id(const char *filename, void *build_id, size_t size __maybe_unused)
+int sysfs__read_build_id(const char *filename, struct build_id *bid)
{
- struct build_id bid;
int fd;
int ret = -1;
struct stat stbuf;
@@ -246,9 +245,7 @@ int sysfs__read_build_id(const char *filename, void *build_id, size_t size __may
if (read(fd, buf, buf_size) != (ssize_t) buf_size)
goto out_free;

- ret = read_build_id(buf, buf_size, &bid, false);
- if (ret > 0)
- memcpy(build_id, bid.data, bid.size);
+ ret = read_build_id(buf, buf_size, bid, false);
out_free:
free(buf);
out:
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 4c43bb959fee..dd1cf91c62fb 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -2122,7 +2122,7 @@ static bool filename__readable(const char *file)

static char *dso__find_kallsyms(struct dso *dso, struct map *map)
{
- u8 host_build_id[BUILD_ID_SIZE];
+ struct build_id bid;
char sbuild_id[SBUILD_ID_SIZE];
bool is_host = false;
char path[PATH_MAX];
@@ -2135,9 +2135,8 @@ static char *dso__find_kallsyms(struct dso *dso, struct map *map)
goto proc_kallsyms;
}

- if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
- sizeof(host_build_id)) == 0)
- is_host = dso__build_id_equal(dso, host_build_id);
+ if (sysfs__read_build_id("/sys/kernel/notes", &bid) == 0)
+ is_host = dso__build_id_equal(dso, bid.data);

/* Try a fast path for /proc/kallsyms if possible */
if (is_host) {
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 98908fa3f796..70b3874e7dd8 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -144,7 +144,7 @@ struct symbol *dso__next_symbol(struct symbol *sym);
enum dso_type dso__type_fd(int fd);

int filename__read_build_id(const char *filename, struct build_id *id);
-int sysfs__read_build_id(const char *filename, void *bf, size_t size);
+int sysfs__read_build_id(const char *filename, struct build_id *bid);
int modules__parse(const char *filename, void *arg,
int (*process_module)(void *arg, const char *name,
u64 start, u64 size));
--
2.26.2
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