netdev - [PATCH] perf tools: Use of the macro IS_ERR_OR

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Date:   Mon, 21 Oct 2019 17:29:33 +0800
From:   Yi Li <yili@...hong.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     yili@...hong.com, Yi Li <yilikernel@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Changbin Du <changbin.du@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH] perf tools: Use of the macro IS_ERR_OR_NULL

From: Yi Li <yilikernel@...il.com>

This patch introduces the use of the macro IS_ERR_OR_NULL in place of
tests for NULL and IS_ERR.

The following Coccinelle semantic patch was used for making the change:

@@
expression e;
@@

- !e || IS_ERR(e)
+ IS_ERR_OR_NULL(e)
 || ...

Signed-off-by: Yi Li <yilikernel@...il.com>
---
 tools/perf/util/bpf-loader.c   | 13 +++++++------
 tools/perf/util/parse-events.c |  2 +-
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index 10c187b..b14d224 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -426,7 +426,7 @@ preproc_gen_prologue(struct bpf_program *prog, int n,
 	size_t prologue_cnt = 0;
 	int i, err;
 
-	if (IS_ERR(priv) || !priv || priv->is_tp)
+	if (IS_ERR_OR_NULL(priv) || priv->is_tp)
 		goto errout;
 
 	pev = &priv->pev;
@@ -578,7 +578,7 @@ static int hook_load_preprocessor(struct bpf_program *prog)
 	bool need_prologue = false;
 	int err, i;
 
-	if (IS_ERR(priv) || !priv) {
+	if (IS_ERR_OR_NULL(priv)) {
 		pr_debug("Internal error when hook preprocessor\n");
 		return -BPF_LOADER_ERRNO__INTERNAL;
 	}
@@ -650,8 +650,9 @@ int bpf__probe(struct bpf_object *obj)
 			goto out;
 
 		priv = bpf_program__priv(prog);
-		if (IS_ERR(priv) || !priv) {
-			err = PTR_ERR(priv);
+		if (IS_ERR_OR_NULL(priv)) {
+			pr_debug("bpf: failed to get private field\n");
+			err = -BPF_LOADER_ERRNO__INTERNAL;
 			goto out;
 		}
 
@@ -701,7 +702,7 @@ int bpf__unprobe(struct bpf_object *obj)
 		struct bpf_prog_priv *priv = bpf_program__priv(prog);
 		int i;
 
-		if (IS_ERR(priv) || !priv || priv->is_tp)
+		if (IS_ERR_OR_NULL(priv) || priv->is_tp)
 			continue;
 
 		for (i = 0; i < priv->pev.ntevs; i++) {
@@ -759,7 +760,7 @@ int bpf__foreach_event(struct bpf_object *obj,
 		struct perf_probe_event *pev;
 		int i, fd;
 
-		if (IS_ERR(priv) || !priv) {
+		if (IS_ERR_OR_NULL(priv)) {
 			pr_debug("bpf: failed to get private field\n");
 			return -BPF_LOADER_ERRNO__INTERNAL;
 		}
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index b5e2ade..609c31f 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -690,7 +690,7 @@ int parse_events_load_bpf_obj(struct parse_events_state *parse_state,
 	struct __add_bpf_event_param param = {parse_state, list, head_config};
 	static bool registered_unprobe_atexit = false;
 
-	if (IS_ERR(obj) || !obj) {
+	if (IS_ERR_OR_NULL(obj)) {
 		snprintf(errbuf, sizeof(errbuf),
 			 "Internal error: load bpf obj with NULL");
 		err = -EINVAL;
-- 
2.7.5