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| author | Eduard Zingerman <eddyz87@gmail.com> | 2022-10-01 13:44:24 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-04-20 13:10:24 +0300 |
| commit | 59dc9767cefbe4b931054bfab39d6aab0bb040f5 (patch) | |
| tree | d427d0ded98addc4178cbae1c9d9b2e569d5206e | |
| parent | 2765aca637761db530d7a285bdb85ea1a10318af (diff) | |
| download | linux-59dc9767cefbe4b931054bfab39d6aab0bb040f5.tar.xz | |
bpftool: Print newline before '}' for struct with padding only fields
[ Upstream commit 44a726c3f23cf762ef4ce3c1709aefbcbe97f62c ]
btf_dump_emit_struct_def attempts to print empty structures at a
single line, e.g. `struct empty {}`. However, it has to account for a
case when there are no regular but some padding fields in the struct.
In such case `vlen` would be zero, but size would be non-zero.
E.g. here is struct bpf_timer from vmlinux.h before this patch:
struct bpf_timer {
long: 64;
long: 64;};
And after this patch:
struct bpf_dynptr {
long: 64;
long: 64;
};
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20221001104425.415768-1-eddyz87@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | tools/lib/bpf/btf_dump.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c index 558d34fbd331..6a8d8ed34b76 100644 --- a/tools/lib/bpf/btf_dump.c +++ b/tools/lib/bpf/btf_dump.c @@ -969,7 +969,11 @@ static void btf_dump_emit_struct_def(struct btf_dump *d, if (is_struct) btf_dump_emit_bit_padding(d, off, t->size * 8, align, false, lvl + 1); - if (vlen) + /* + * Keep `struct empty {}` on a single line, + * only print newline when there are regular or padding fields. + */ + if (vlen || t->size) btf_dump_printf(d, "\n"); btf_dump_printf(d, "%s}", pfx(lvl)); if (packed) |