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authorArnaldo Carvalho de Melo <acme@redhat.com>2016-06-02 10:51:59 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-06-06 18:18:30 -0300
commitb4cbfa5670414a567a8a3b368047538f522eff6a (patch)
treef76a09d058aefe3c5c7ebbf1c1560e5813d1b474 /tools
parent7db91f251056f90fec4121f028680ab3153a0f3c (diff)
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@huawei.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Milian Wolff <milian.wolff@kdab.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/n/tip-saypxyd6ptrct379jqgxx4bl@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/lib/bpf/libbpf.c9
-rw-r--r--tools/lib/bpf/libbpf.h2
-rw-r--r--tools/perf/util/bpf-loader.c23
3 files changed, 12 insertions, 22 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 7e543c3102d4..9bba1a907abe 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 a51594c7b518..916abf971249 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 493307d1414c..e9a034e86b91 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;