linux-kernel - [PATCH] samples: bpf: Replace sizeof(arr)/sizeof(arr[0]) with ARRAY

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Date:   Tue, 12 Jul 2022 15:23:02 +0800
From:   xiaolinkui <xiaolinkui@...il.com>
To:     xiaolinkui@...il.com, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
        yhs@...com, john.fastabend@...il.com, kpsingh@...nel.org,
        sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linkui Xiao <xiaolinkui@...inos.cn>
Subject: [PATCH] samples: bpf: Replace sizeof(arr)/sizeof(arr[0]) with ARRAY_SIZE

From: Linkui Xiao<xiaolinkui@...inos.cn>

The ARRAY_SIZE macro is more compact and more formal in linux source.

Signed-off-by: Linkui Xiao<xiaolinkui@...inos.cn>
---
 samples/bpf/fds_example.c          | 3 ++-
 samples/bpf/sock_example.c         | 3 ++-
 samples/bpf/test_cgrp2_attach.c    | 3 ++-
 samples/bpf/test_lru_dist.c        | 2 +-
 samples/bpf/test_map_in_map_user.c | 4 +++-
 samples/bpf/tracex5_user.c         | 3 ++-
 6 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/samples/bpf/fds_example.c b/samples/bpf/fds_example.c
index 16dbf49e0f19..88a26f3ce201 100644
--- a/samples/bpf/fds_example.c
+++ b/samples/bpf/fds_example.c
@@ -17,6 +17,7 @@
 #include <bpf/libbpf.h>
 #include "bpf_insn.h"
 #include "sock_example.h"
+#include "bpf_util.h"
 
 #define BPF_F_PIN	(1 << 0)
 #define BPF_F_GET	(1 << 1)
@@ -52,7 +53,7 @@ static int bpf_prog_create(const char *object)
 		BPF_MOV64_IMM(BPF_REG_0, 1),
 		BPF_EXIT_INSN(),
 	};
-	size_t insns_cnt = sizeof(insns) / sizeof(struct bpf_insn);
+	size_t insns_cnt = ARRAY_SIZE(insns);
 	struct bpf_object *obj;
 	int err;
 
diff --git a/samples/bpf/sock_example.c b/samples/bpf/sock_example.c
index a88f69504c08..5b66f2401b96 100644
--- a/samples/bpf/sock_example.c
+++ b/samples/bpf/sock_example.c
@@ -29,6 +29,7 @@
 #include <bpf/bpf.h>
 #include "bpf_insn.h"
 #include "sock_example.h"
+#include "bpf_util.h"
 
 char bpf_log_buf[BPF_LOG_BUF_SIZE];
 
@@ -58,7 +59,7 @@ static int test_sock(void)
 		BPF_MOV64_IMM(BPF_REG_0, 0), /* r0 = 0 */
 		BPF_EXIT_INSN(),
 	};
-	size_t insns_cnt = sizeof(prog) / sizeof(struct bpf_insn);
+	size_t insns_cnt = ARRAY_SIZE(prog);
 	LIBBPF_OPTS(bpf_prog_load_opts, opts,
 		.log_buf = bpf_log_buf,
 		.log_size = BPF_LOG_BUF_SIZE,
diff --git a/samples/bpf/test_cgrp2_attach.c b/samples/bpf/test_cgrp2_attach.c
index 6d90874b09c3..68ce69457afe 100644
--- a/samples/bpf/test_cgrp2_attach.c
+++ b/samples/bpf/test_cgrp2_attach.c
@@ -31,6 +31,7 @@
 #include <bpf/bpf.h>
 
 #include "bpf_insn.h"
+#include "bpf_util.h"
 
 enum {
 	MAP_KEY_PACKETS,
@@ -70,7 +71,7 @@ static int prog_load(int map_fd, int verdict)
 		BPF_MOV64_IMM(BPF_REG_0, verdict), /* r0 = verdict */
 		BPF_EXIT_INSN(),
 	};
-	size_t insns_cnt = sizeof(prog) / sizeof(struct bpf_insn);
+	size_t insns_cnt = ARRAY_SIZE(prog);
 	LIBBPF_OPTS(bpf_prog_load_opts, opts,
 		.log_buf = bpf_log_buf,
 		.log_size = BPF_LOG_BUF_SIZE,
diff --git a/samples/bpf/test_lru_dist.c b/samples/bpf/test_lru_dist.c
index be98ccb4952f..5efb91763d65 100644
--- a/samples/bpf/test_lru_dist.c
+++ b/samples/bpf/test_lru_dist.c
@@ -523,7 +523,7 @@ int main(int argc, char **argv)
 		return -1;
 	}
 
-	for (f = 0; f < sizeof(map_flags) / sizeof(*map_flags); f++) {
+	for (f = 0; f < ARRAY_SIZE(map_flags); f++) {
 		test_lru_loss0(BPF_MAP_TYPE_LRU_HASH, map_flags[f]);
 		test_lru_loss1(BPF_MAP_TYPE_LRU_HASH, map_flags[f]);
 		test_parallel_lru_loss(BPF_MAP_TYPE_LRU_HASH, map_flags[f],
diff --git a/samples/bpf/test_map_in_map_user.c b/samples/bpf/test_map_in_map_user.c
index e8b4cc184ac9..652ec720533d 100644
--- a/samples/bpf/test_map_in_map_user.c
+++ b/samples/bpf/test_map_in_map_user.c
@@ -12,6 +12,8 @@
 #include <bpf/bpf.h>
 #include <bpf/libbpf.h>
 
+#include "bpf_util.h"
+
 static int map_fd[7];
 
 #define PORT_A		(map_fd[0])
@@ -28,7 +30,7 @@ static const char * const test_names[] = {
 	"Hash of Hash",
 };
 
-#define NR_TESTS (sizeof(test_names) / sizeof(*test_names))
+#define NR_TESTS ARRAY_SIZE(test_names)
 
 static void check_map_id(int inner_map_fd, int map_in_map_fd, uint32_t key)
 {
diff --git a/samples/bpf/tracex5_user.c b/samples/bpf/tracex5_user.c
index e910dc265c31..9d7d79f0d47d 100644
--- a/samples/bpf/tracex5_user.c
+++ b/samples/bpf/tracex5_user.c
@@ -8,6 +8,7 @@
 #include <bpf/bpf.h>
 #include <bpf/libbpf.h>
 #include "trace_helpers.h"
+#include "bpf_util.h"
 
 #ifdef __mips__
 #define	MAX_ENTRIES  6000 /* MIPS n64 syscalls start at 5000 */
@@ -24,7 +25,7 @@ static void install_accept_all_seccomp(void)
 		BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW),
 	};
 	struct sock_fprog prog = {
-		.len = (unsigned short)(sizeof(filter)/sizeof(filter[0])),
+		.len = (unsigned short)ARRAY_SIZE(filter),
 		.filter = filter,
 	};
 	if (prctl(PR_SET_SECCOMP, 2, &prog))
-- 
2.17.1