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Date: Tue, 12 Jul 2022 16:15:11 +0200
From: Jiri Olsa <olsajiri@...il.com>
To: xiaolinkui <xiaolinkui@...il.com>
Cc: 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, bpf@...r.kernel.org,
linux-kernel@...r.kernel.org, Linkui Xiao <xiaolinkui@...inos.cn>
Subject: Re: [PATCH] samples: bpf: Replace sizeof(arr)/sizeof(arr[0]) with
ARRAY_SIZE
On Tue, Jul 12, 2022 at 03:23:02PM +0800, xiaolinkui wrote:
> 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>
LGTM
Acked-by: Jiri Olsa <jolsa@...nel.org>
jirka
> ---
> 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
>
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