Commit-ID: b4cbfa5670414a567a8a3b368047538f522eff6a
Gitweb: http://git.kernel.org/tip/b4cbfa5670414a567a8a3b368047538f522eff6a
Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Thu, 2 Jun 2016 10:51:59 -0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Mon, 6 Jun 2016 18:18:30 -0300
tools lib bpf: Use IS_ERR() reporting macros with bpf_map__get_private()
To try to, over time, consistently use the IS_ERR() interface instead of
using two return values, i.e. the integer return value for an error and
the pointer address to return the bpf_map->priv pointer.
Also rename it to bpf__priv(), to leave the "get" term for reference
counting.
Noticed while working on using BPF for collecting non-integer syscall
argument payloads (struct sockaddr in calls such as connect(), for
instance), where we need to use BPF maps and thus generalise
bpf__setup_stdout() to connect bpf_output events with maps in a bpf
proggie.
Acked-by: Wang Nan <wangnan0@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Milian Wolff <milian.wolff@xxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-saypxyd6ptrct379jqgxx4bl@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/lib/bpf/libbpf.c | 9 ++-------
tools/lib/bpf/libbpf.h | 2 +-
tools/perf/util/bpf-loader.c | 23 +++++++++--------------
3 files changed, 12 insertions(+), 22 deletions(-)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 7e543c3..9bba1a9 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -1351,14 +1351,9 @@ int bpf_map__set_private(struct bpf_map *map, void *priv,
return 0;
}
-int bpf_map__get_private(struct bpf_map *map, void **ppriv)
+void *bpf_map__priv(struct bpf_map *map)
{
- if (!map)
- return -EINVAL;
-
- if (ppriv)
- *ppriv = map->priv;
- return 0;
+ return map ? map->priv : ERR_PTR(-EINVAL);
}
struct bpf_map *
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index a51594c..916abf9 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -187,6 +187,6 @@ const char *bpf_map__get_name(struct bpf_map *map);
typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *);
int bpf_map__set_private(struct bpf_map *map, void *priv,
bpf_map_clear_priv_t clear_priv);
-int bpf_map__get_private(struct bpf_map *map, void **ppriv);
+void *bpf_map__priv(struct bpf_map *map);
#endif
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index 493307d..e9a034e 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -897,15 +897,13 @@ bpf_map_priv__clone(struct bpf_map_priv *priv)
static int
bpf_map__add_op(struct bpf_map *map, struct bpf_map_op *op)
{
- struct bpf_map_priv *priv;
+ struct bpf_map_priv *priv = bpf_map__priv(map);
const char *map_name;
- int err;
map_name = bpf_map__get_name(map);
- err = bpf_map__get_private(map, (void **)&priv);
- if (err) {
+ if (IS_ERR(priv)) {
pr_debug("Failed to get private from map %s\n", map_name);
- return err;
+ return PTR_ERR(priv);
}
if (!priv) {
@@ -1264,12 +1262,11 @@ bpf_map_config_foreach_key(struct bpf_map *map,
const char *name;
struct bpf_map_op *op;
struct bpf_map_def def;
- struct bpf_map_priv *priv;
+ struct bpf_map_priv *priv = bpf_map__priv(map);
name = bpf_map__get_name(map);
- err = bpf_map__get_private(map, (void **)&priv);
- if (err) {
+ if (IS_ERR(priv)) {
pr_debug("ERROR: failed to get private from map %s\n", name);
return -BPF_LOADER_ERRNO__INTERNAL;
}
@@ -1489,10 +1486,9 @@ int bpf__setup_stdout(struct perf_evlist *evlist __maybe_unused)
bool need_init = false;
bpf__for_each_stdout_map(map, obj, tmp) {
- struct bpf_map_priv *priv;
+ struct bpf_map_priv *priv = bpf_map__priv(map);
- err = bpf_map__get_private(map, (void **)&priv);
- if (err)
+ if (IS_ERR(priv))
return -BPF_LOADER_ERRNO__INTERNAL;
/*
@@ -1520,10 +1516,9 @@ int bpf__setup_stdout(struct perf_evlist *evlist __maybe_unused)
}
bpf__for_each_stdout_map(map, obj, tmp) {
- struct bpf_map_priv *priv;
+ struct bpf_map_priv *priv = bpf_map__priv(map);
- err = bpf_map__get_private(map, (void **)&priv);
- if (err)
+ if (IS_ERR(priv))
return -BPF_LOADER_ERRNO__INTERNAL;
if (priv)
continue;
--
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