selftests: bpf: Replace sizeof(arr)/sizeof(arr[0]) with ARRAY_SIZE

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

Signed-off-by: Feng Yang <yangfeng@kylinos.cn>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240903072559.292607-1-yangfeng59949@163.com

tools/testing/selftests/bpf/prog_tests/fexit_stress.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 /* Copyright (c) 2019 Facebook */
 #include <test_progs.h>
+#include "bpf_util.h"
 
 void serial_test_fexit_stress(void)
 {
@@ -36,7 +37,7 @@ void serial_test_fexit_stress(void)
 	for (i = 0; i < bpf_max_tramp_links; i++) {
 		fexit_fd[i] = bpf_prog_load(BPF_PROG_TYPE_TRACING, NULL, "GPL",
 					    trace_program,
-					    sizeof(trace_program) / sizeof(struct bpf_insn),
+					    ARRAY_SIZE(trace_program),
 					    &trace_opts);
 		if (!ASSERT_GE(fexit_fd[i], 0, "fexit load"))
 			goto out;

tools/testing/selftests/bpf/prog_tests/log_buf.c

@@ -5,6 +5,7 @@
 #include <bpf/btf.h>
 
 #include "test_log_buf.skel.h"
+#include "bpf_util.h"
 
 static size_t libbpf_log_pos;
 static char libbpf_log_buf[1024 * 1024];
@@ -143,11 +144,11 @@ static void bpf_prog_load_log_buf(void)
 		BPF_MOV64_IMM(BPF_REG_0, 0),
 		BPF_EXIT_INSN(),
 	};
-	const size_t good_prog_insn_cnt = sizeof(good_prog_insns) / sizeof(struct bpf_insn);
+	const size_t good_prog_insn_cnt = ARRAY_SIZE(good_prog_insns);
 	const struct bpf_insn bad_prog_insns[] = {
 		BPF_EXIT_INSN(),
 	};
-	size_t bad_prog_insn_cnt = sizeof(bad_prog_insns) / sizeof(struct bpf_insn);
+	size_t bad_prog_insn_cnt = ARRAY_SIZE(bad_prog_insns);
 	LIBBPF_OPTS(bpf_prog_load_opts, opts);
 	const size_t log_buf_sz = 1024 * 1024;
 	char *log_buf;

tools/testing/selftests/bpf/prog_tests/module_fentry_shadow.c

@@ -4,6 +4,7 @@
 #include <bpf/btf.h>
 #include "bpf/libbpf_internal.h"
 #include "cgroup_helpers.h"
+#include "bpf_util.h"
 
 static const char *module_name = "bpf_testmod";
 static const char *symbol_name = "bpf_fentry_shadow_test";
@@ -100,7 +101,7 @@ void test_module_fentry_shadow(void)
 		load_opts.attach_btf_obj_fd = btf_fd[i];
 		prog_fd[i] = bpf_prog_load(BPF_PROG_TYPE_TRACING, NULL, "GPL",
 					   trace_program,
-					   sizeof(trace_program) / sizeof(struct bpf_insn),
+					   ARRAY_SIZE(trace_program),
 					   &load_opts);
 		if (!ASSERT_GE(prog_fd[i], 0, "bpf_prog_load"))
 			goto out;

tools/testing/selftests/bpf/prog_tests/raw_tp_writable_reject_nbd_invalid.c

@@ -2,6 +2,7 @@
 
 #include <test_progs.h>
 #include <linux/nbd.h>
+#include "bpf_util.h"
 
 void test_raw_tp_writable_reject_nbd_invalid(void)
 {
@@ -25,7 +26,7 @@ void test_raw_tp_writable_reject_nbd_invalid(void)
 	);
 
 	bpf_fd = bpf_prog_load(BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE, NULL, "GPL v2",
-			       program, sizeof(program) / sizeof(struct bpf_insn),
+			       program, ARRAY_SIZE(program),
 			       &opts);
 	if (CHECK(bpf_fd < 0, "bpf_raw_tracepoint_writable load",
 		  "failed: %d errno %d\n", bpf_fd, errno))

tools/testing/selftests/bpf/prog_tests/raw_tp_writable_test_run.c

@@ -2,6 +2,7 @@
 
 #include <test_progs.h>
 #include <linux/nbd.h>
+#include "bpf_util.h"
 
 /* NOTE: conflict with other tests. */
 void serial_test_raw_tp_writable_test_run(void)
@@ -24,7 +25,7 @@ void serial_test_raw_tp_writable_test_run(void)
 	);
 
 	int bpf_fd = bpf_prog_load(BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE, NULL, "GPL v2",
-				   trace_program, sizeof(trace_program) / sizeof(struct bpf_insn),
+				   trace_program, ARRAY_SIZE(trace_program),
 				   &trace_opts);
 	if (CHECK(bpf_fd < 0, "bpf_raw_tracepoint_writable loaded",
 		  "failed: %d errno %d\n", bpf_fd, errno))
@@ -41,7 +42,7 @@ void serial_test_raw_tp_writable_test_run(void)
 	);
 
 	int filter_fd = bpf_prog_load(BPF_PROG_TYPE_SOCKET_FILTER, NULL, "GPL v2",
-				      skb_program, sizeof(skb_program) / sizeof(struct bpf_insn),
+				      skb_program, ARRAY_SIZE(skb_program),
 				      &skb_opts);
 	if (CHECK(filter_fd < 0, "test_program_loaded", "failed: %d errno %d\n",
 		  filter_fd, errno))

tools/testing/selftests/bpf/prog_tests/tc_opts.c

@@ -2384,7 +2384,7 @@ static int generate_dummy_prog(void)
 		BPF_MOV64_IMM(BPF_REG_0, 0),
 		BPF_EXIT_INSN(),
 	};
-	const size_t prog_insn_cnt = sizeof(prog_insns) / sizeof(struct bpf_insn);
+	const size_t prog_insn_cnt = ARRAY_SIZE(prog_insns);
 	LIBBPF_OPTS(bpf_prog_load_opts, opts);
 	const size_t log_buf_sz = 256;
 	char log_buf[log_buf_sz];

tools/testing/selftests/bpf/prog_tests/unpriv_bpf_disabled.c

@@ -7,6 +7,7 @@
 #include "test_unpriv_bpf_disabled.skel.h"
 
 #include "cap_helpers.h"
+#include "bpf_util.h"
 
 /* Using CAP_LAST_CAP is risky here, since it can get pulled in from
  * an old /usr/include/linux/capability.h and be < CAP_BPF; as a result
@@ -146,7 +147,7 @@ static void test_unpriv_bpf_disabled_negative(struct test_unpriv_bpf_disabled *s
 		BPF_MOV64_IMM(BPF_REG_0, 0),
 		BPF_EXIT_INSN(),
 	};
-	const size_t prog_insn_cnt = sizeof(prog_insns) / sizeof(struct bpf_insn);
+	const size_t prog_insn_cnt = ARRAY_SIZE(prog_insns);
 	LIBBPF_OPTS(bpf_prog_load_opts, load_opts);
 	struct bpf_map_info map_info = {};
 	__u32 map_info_len = sizeof(map_info);

tools/testing/selftests/bpf/progs/syscall.c

@@ -8,6 +8,7 @@
 #include <linux/btf.h>
 #include <string.h>
 #include <errno.h>
+#include "bpf_misc.h"
 
 char _license[] SEC("license") = "GPL";
 
@@ -119,7 +120,7 @@ int load_prog(struct args *ctx)
 	static __u64 value = 34;
 	static union bpf_attr prog_load_attr = {
 		.prog_type = BPF_PROG_TYPE_XDP,
-		.insn_cnt = sizeof(insns) / sizeof(insns[0]),
+		.insn_cnt = ARRAY_SIZE(insns),
 	};
 	int ret;
 

tools/testing/selftests/bpf/progs/test_rdonly_maps.c

@@ -4,6 +4,7 @@
 #include <linux/ptrace.h>
 #include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
 
 const struct {
 	unsigned a[4];
@@ -64,7 +65,7 @@ int full_loop(struct pt_regs *ctx)
 {
 	/* prevent compiler to optimize everything out */
 	unsigned * volatile p = (void *)&rdonly_values.a;
-	int i = sizeof(rdonly_values.a) / sizeof(rdonly_values.a[0]);
+	int i = ARRAY_SIZE(rdonly_values.a);
 	unsigned iters = 0, sum = 0;
 
 	/* validate verifier can allow full loop as well */

tools/testing/selftests/bpf/progs/verifier_bits_iter.c

@@ -87,7 +87,7 @@ int bits_memalloc(void)
 	int *bit;
 
 	__builtin_memset(&data, 0xf0, sizeof(data)); /* 4 * 16 */
-	bpf_for_each(bits, bit, &data[0], sizeof(data) / sizeof(u64))
+	bpf_for_each(bits, bit, &data[0], ARRAY_SIZE(data))
 		nr++;
 	return nr;
 }