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libbpf: Support pre-initializing .bss global variables

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Remove invalid assumption in libbpf that .bss map doesn't have to be updated
in kernel. With addition of skeleton and memory-mapped initialization image,
.bss doesn't have to be all zeroes when BPF map is created, because user-code
might have initialized those variables from user-space.

Fixes: eba9c5f498a1 ("libbpf: Refactor global data map initialization")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200612194504.557844-1-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
2020-06-12 12:45:04 -07:00
committed by Andrii Nakryiko
parent 46c272f9b4
commit bf34234885
1 changed files with 0 additions and 4 deletions
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4
src/libbpf.c
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@@ -3564,10 +3564,6 @@ bpf_object__populate_internal_map(struct bpf_object *obj, struct bpf_map *map)
char *cp, errmsg[STRERR_BUFSIZE];
int err, zero = 0;
/* kernel already zero-initializes .bss map. */
if (map_type == LIBBPF_MAP_BSS)
return 0;
err = bpf_map_update_elem(map->fd, &zero, map->mmaped, 0);
if (err) {
err = -errno;