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linux/tools/lib/bpf
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Andrii Nakryiko 811dee26b4 libbpf: Fix no-args func prototype BTF dumping syntax 
[ Upstream commit 189f1a976e ]

For all these years libbpf's BTF dumper has been emitting not strictly
valid syntax for function prototypes that have no input arguments.

Instead of `int (*blah)()` we should emit `int (*blah)(void)`.

This is not normally a problem, but it manifests when we get kfuncs in
vmlinux.h that have no input arguments. Due to compiler internal
specifics, we get no BTF information for such kfuncs, if they are not
declared with proper `(void)`.

The fix is trivial. We also need to adjust a few ancient tests that
happily assumed `()` is correct.

Fixes: 351131b51c ("libbpf: add btf_dump API for BTF-to-C conversion")
Reported-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://lore.kernel.org/bpf/20240712224442.282823-1-andrii@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-08-03 08:49:48 +02:00
..
.gitignore libbpf: Make libbpf_version.h non-auto-generated 2021-09-13 15:36:47 -07:00
bpf.c libbpf: Clean up deprecated and legacy aliases 2022-08-17 22:42:56 +02:00
bpf.h libbpf: Add missing LIBBPF_API annotation to libbpf_set_memlock_rlim API 2024-03-26 18:20:32 -04:00
bpf_core_read.h bpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD 2024-07-11 12:47:09 +02:00
bpf_endian.h libbpf: Make bpf_endian co-exist with vmlinux.h 2020-07-01 09:06:12 +02:00
bpf_gen_internal.h Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2021-12-10 15:56:13 -08:00
bpf_helpers.h libbpf: fix offsetof() and container_of() to work with CO-RE 2023-07-19 16:21:04 +02:00
bpf_prog_linfo.c libbpf: Streamline error reporting for high-level APIs 2021-05-25 17:32:35 -07:00
bpf_tracing.h libbpf: Fix invalid return address register in s390 2023-03-10 09:32:51 +01:00
btf.c libbpf: Fix btf__align_of() by taking into account field offsets 2023-03-10 09:32:49 +01:00
btf.h libbpf: Don't require full struct enum64 in UAPI headers 2022-09-27 20:45:17 +02:00
btf_dump.c libbpf: Fix no-args func prototype BTF dumping syntax 2024-08-03 08:49:48 +02:00
Build libbpf: move xsk.{c,h} into selftests/bpf 2022-06-28 13:13:32 -07:00
gen_loader.c libbpf: Fix ld_imm64 copy logic for ksym in light skeleton. 2023-05-11 23:03:18 +09:00
hashmap.c libbpf: Use IS_ERR_OR_NULL() in hashmap__free() 2022-01-12 17:01:36 -08:00
hashmap.h libbpf, hashmap: Fix undefined behavior in hash_bits 2020-11-02 23:33:51 +01:00
libbpf.c libbpf: Fix error message in attach_kprobe_multi 2024-06-12 11:03:15 +02:00
libbpf.h libbpf: restore memory layout of bpf_object_open_opts 2022-09-23 16:19:37 -07:00
libbpf.map bpf: Add libbpf logic for user-space ring buffer 2022-09-21 16:25:03 -07:00
libbpf.pc.template libbpf: Add zlib as a dependency in pkg-config template 2019-12-16 14:55:29 -08:00
libbpf_common.h libbpf: cleanup LIBBPF_DEPRECATED_SINCE supporting macros for v0.x 2022-06-28 13:13:33 -07:00
libbpf_errno.c libbpf: Streamline error reporting for high-level APIs 2021-05-25 17:32:35 -07:00
libbpf_internal.h libbpf: Fix faccessat() usage on Android 2024-03-26 18:20:32 -04:00
libbpf_legacy.h libbpf: Clean up deprecated and legacy aliases 2022-08-17 22:42:56 +02:00
libbpf_probes.c libbpf: Use page size as max_entries when probing ring buffer map 2022-11-17 15:46:05 -08:00
libbpf_version.h bpf: Add libbpf logic for user-space ring buffer 2022-09-21 16:25:03 -07:00
linker.c libbpf: Checking the btf_type kind when fixing variable offsets 2024-08-03 08:49:06 +02:00
Makefile libbpf: move xsk.{c,h} into selftests/bpf 2022-06-28 13:13:32 -07:00
netlink.c libbpf: Streamline bpf_attr and perf_event_attr initialization 2022-08-17 22:42:10 +02:00
nlattr.c libbpf: Fix alen calculation in libbpf_nla_dump_errormsg() 2023-03-10 09:33:02 +01:00
nlattr.h libbpf: Switch to void * casting in netlink helpers 2021-06-22 17:04:02 +02:00
relo_core.c bpf: Correctly propagate errors up from bpf_core_composites_match 2022-07-08 15:31:43 -07:00
relo_core.h bpf, libbpf: Add type match support 2022-07-05 21:14:25 -07:00
ringbuf.c libbpf: Check the validity of size in user_ring_buffer__reserve() 2022-11-17 15:49:59 -08:00
skel_internal.h libbpf: add map_get_fd_by_id and map_delete_elem in light skeleton 2022-08-25 18:52:29 -07:00
str_error.c libbpf: Poison kernel-only integer types 2020-01-10 10:38:00 -08:00
str_error.h libbpf: relicense libbpf as LGPL-2.1 OR BSD-2-Clause 2018-10-08 10:09:48 +02:00
strset.c libbpf: Fix memory leak in strset 2021-10-01 22:54:38 +02:00
strset.h libbpf: Extract internal set-of-strings datastructure APIs 2021-03-18 16:14:22 -07:00
usdt.bpf.h libbpf: Ensure functions with always_inline attribute are inline 2022-08-04 14:43:41 -07:00
usdt.c libbpf: Fix realloc API handling in zero-sized edge cases 2023-09-13 09:42:30 +02:00