The array's contents is a compile time constant. Constify to make the code more intention revealing and avoid unintended errors. Signed-off-by: Ian Rogers --- tools/perf/util/bpf-utils.c | 18 ++++++------------ 1 file changed, 6 insertions(+), 12 deletions(-) diff --git a/tools/perf/util/bpf-utils.c b/tools/perf/util/bpf-utils.c index 80b1d2b3729b..64a558344696 100644 --- a/tools/perf/util/bpf-utils.c +++ b/tools/perf/util/bpf-utils.c @@ -20,7 +20,7 @@ struct bpil_array_desc { */ }; -static struct bpil_array_desc bpil_array_desc[] = { +static const struct bpil_array_desc bpil_array_desc[] = { [PERF_BPIL_JITED_INSNS] = { offsetof(struct bpf_prog_info, jited_prog_insns), offsetof(struct bpf_prog_info, jited_prog_len), @@ -129,12 +129,10 @@ get_bpf_prog_info_linear(int fd, __u64 arrays) /* step 2: calculate total size of all arrays */ for (i = PERF_BPIL_FIRST_ARRAY; i < PERF_BPIL_LAST_ARRAY; ++i) { + const struct bpil_array_desc *desc = &bpil_array_desc[i]; bool include_array = (arrays & (1UL << i)) > 0; - struct bpil_array_desc *desc; __u32 count, size; - desc = bpil_array_desc + i; - /* kernel is too old to support this field */ if (info_len < desc->array_offset + sizeof(__u32) || info_len < desc->count_offset + sizeof(__u32) || @@ -163,13 +161,12 @@ get_bpf_prog_info_linear(int fd, __u64 arrays) ptr = info_linear->data; for (i = PERF_BPIL_FIRST_ARRAY; i < PERF_BPIL_LAST_ARRAY; ++i) { - struct bpil_array_desc *desc; + const struct bpil_array_desc *desc = &bpil_array_desc[i]; __u32 count, size; if ((arrays & (1UL << i)) == 0) continue; - desc = bpil_array_desc + i; count = bpf_prog_info_read_offset_u32(&info, desc->count_offset); size = bpf_prog_info_read_offset_u32(&info, desc->size_offset); bpf_prog_info_set_offset_u32(&info_linear->info, @@ -192,13 +189,12 @@ get_bpf_prog_info_linear(int fd, __u64 arrays) /* step 6: verify the data */ for (i = PERF_BPIL_FIRST_ARRAY; i < PERF_BPIL_LAST_ARRAY; ++i) { - struct bpil_array_desc *desc; + const struct bpil_array_desc *desc = &bpil_array_desc[i]; __u32 v1, v2; if ((arrays & (1UL << i)) == 0) continue; - desc = bpil_array_desc + i; v1 = bpf_prog_info_read_offset_u32(&info, desc->count_offset); v2 = bpf_prog_info_read_offset_u32(&info_linear->info, desc->count_offset); @@ -224,13 +220,12 @@ void bpil_addr_to_offs(struct perf_bpil *info_linear) int i; for (i = PERF_BPIL_FIRST_ARRAY; i < PERF_BPIL_LAST_ARRAY; ++i) { - struct bpil_array_desc *desc; + const struct bpil_array_desc *desc = &bpil_array_desc[i]; __u64 addr, offs; if ((info_linear->arrays & (1UL << i)) == 0) continue; - desc = bpil_array_desc + i; addr = bpf_prog_info_read_offset_u64(&info_linear->info, desc->array_offset); offs = addr - ptr_to_u64(info_linear->data); @@ -244,13 +239,12 @@ void bpil_offs_to_addr(struct perf_bpil *info_linear) int i; for (i = PERF_BPIL_FIRST_ARRAY; i < PERF_BPIL_LAST_ARRAY; ++i) { - struct bpil_array_desc *desc; + const struct bpil_array_desc *desc = &bpil_array_desc[i]; __u64 addr, offs; if ((info_linear->arrays & (1UL << i)) == 0) continue; - desc = bpil_array_desc + i; offs = bpf_prog_info_read_offset_u64(&info_linear->info, desc->array_offset); addr = offs + ptr_to_u64(info_linear->data); -- 2.51.0.355.g5224444f11-goog