[tip:perf/core] perf bpf: Use ERR_CAST instead of ERR_PTR(PTR_ERR())

[tip-bot for Wen Yang]

Commit-ID:  132efb95080bcf690bdfea1b6f0d57853ee4d48f
Gitweb:     https://git.kernel.org/tip/132efb95080bcf690bdfea1b6f0d57853ee4d48f
Author:     Wen Yang <wen.yang99@xxxxxxxxxx>
AuthorDate: Tue, 27 Nov 2018 17:06:10 +0800
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 29 Nov 2018 20:42:48 -0300

perf bpf: Use ERR_CAST instead of ERR_PTR(PTR_ERR())

Use ERR_CAST inlined function instead of ERR_PTR(PTR_ERR(...)).  This
makes it more readable and also fix this warning detected by
err_cast.cocci:

  tools/perf/util/bpf-loader.c:1606:11-18: WARNING: ERR_CAST can be used with op

Signed-off-by: Wen Yang <wen.yang99@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Julia Lawall <julia.lawall@xxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Wen Yang <yellowriver2010@xxxxxxxxxxx>
Cc: zhong.weidong@xxxxxxxxxx
Link: http://lkml.kernel.org/r/20181127090610.28488-1-wen.yang99@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/bpf-loader.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index f9ae1a993806..9a280647d829 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -1603,7 +1603,7 @@ struct perf_evsel *bpf__setup_output_event(struct perf_evlist *evlist, const cha
 
 			op = bpf_map__add_newop(map, NULL);
 			if (IS_ERR(op))
-				return ERR_PTR(PTR_ERR(op));
+				return ERR_CAST(op);
 			op->op_type = BPF_MAP_OP_SET_EVSEL;
 			op->v.evsel = evsel;
 		}