From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Adrian Hunter <adrian.hunter@intel.com>,
David Ahern <dsahern@gmail.com>, Jiri Olsa <jolsa@kernel.org>,
Milian Wolff <milian.wolff@kdab.com>,
Namhyung Kim <namhyung@kernel.org>
Subject: [PATCH 01/24] tools lib bpf: Use IS_ERR() reporting macros with bpf_map__get_private()
Date: Tue, 7 Jun 2016 17:04:39 -0300 [thread overview]
Message-ID: <1465329902-11069-2-git-send-email-acme@kernel.org> (raw)
In-Reply-To: <1465329902-11069-1-git-send-email-acme@kernel.org>
From: Arnaldo Carvalho de Melo <acme@redhat.com>
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>
---
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 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;
--
2.5.5
next prev parent reply other threads:[~2016-06-07 20:12 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-07 20:04 [GIT PULL 00/24] perf/core improvements and fixes Arnaldo Carvalho de Melo
2016-06-07 20:04 ` Arnaldo Carvalho de Melo [this message]
2016-06-07 20:04 ` [PATCH 02/24] tools lib bpf: Rename bpf_map__get_name() to bpf_map__name() Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 03/24] tools lib bpf: Use IS_ERR() reporting macros with bpf_map__get_def() Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 04/24] tools lib bpf: Rename bpf_map__get_fd() to bpf_map__fd() Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 05/24] tools lib bpf: Remove _get_ from non-refcount method names Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 06/24] tools lib bpf: Make bpf_program__get_private() use IS_ERR() Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 07/24] tools lib bpf: Rename set_private() to set_priv() Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 08/24] perf tools: Fix crash in build_id_cache__kallsyms_path() Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 09/24] perf config: Constructor should free its allocated memory when failing Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 10/24] perf config: Use new perf_config_set__init() to initialize config set Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 11/24] perf unwind: Use LIBUNWIND_DIR for remote libunwind feature check Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 12/24] perf unwind: Decouple thread->address_space on libunwind Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 13/24] perf unwind: Introduce 'struct unwind_libunwind_ops' for local unwind Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 14/24] perf unwind: Move unwind__prepare_access from thread_new into thread__insert_map Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 15/24] perf unwind: Don't mix LIBUNWIND_LIBS into LIBUNWIND_LDFLAGS Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 16/24] perf unwind: Separate local/remote libunwind config Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 17/24] perf unwind: Rename unwind-libunwind.c to unwind-libunwind-local.c Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 18/24] perf tools: Extract common API out of unwind-libunwind-local.c Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 19/24] perf tools: Export normalize_arch() function Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 20/24] perf unwind: Check the target platform before assigning unwind methods Arnaldo Carvalho de Melo
2016-06-07 20:04 ` [PATCH 21/24] perf unwind: Change fixed name of libunwind__arch_reg_id to macro Arnaldo Carvalho de Melo
2016-06-07 20:05 ` [PATCH 22/24] perf unwind: Introduce flag to separate local/remote unwind compilation Arnaldo Carvalho de Melo
2016-06-07 20:05 ` [PATCH 23/24] perf callchain: Support x86 target platform Arnaldo Carvalho de Melo
2016-06-07 20:05 ` [PATCH 24/24] perf callchain: Support aarch64 cross-platform Arnaldo Carvalho de Melo
2016-06-07 23:10 ` [GIT PULL 00/24] perf/core improvements and fixes Taeung Song
2016-06-08 13:09 ` Arnaldo Carvalho de Melo
2016-06-08 7:43 ` Ingo Molnar
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