diff options
| author | Leon Hwang <leon.hwang@linux.dev> | 2025-09-19 07:41:09 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2025-09-23 22:07:46 +0300 |
| commit | ccb4f5d91ec43c05ba165ccfc7ed889eb9cdfd05 (patch) | |
| tree | 0c7b1d0fb83f232083059b08732b027d6aa49205 /include/linux/bpf.h | |
| parent | 2383e45f1da7ac73683ac3494a205bc878a58cc9 (diff) | |
| download | linux-ccb4f5d91ec43c05ba165ccfc7ed889eb9cdfd05.tar.xz | |
bpf: Allow union argument in trampoline based programs
Currently, functions with 'union' arguments cannot be traced with
fentry/fexit:
bpftrace -e 'fentry:release_pages { exit(); }' -v
The function release_pages arg0 type UNION is unsupported.
The type of the 'release_pages' arg0 is defined as:
typedef union {
struct page **pages;
struct folio **folios;
struct encoded_page **encoded_pages;
} release_pages_arg __attribute__ ((__transparent_union__));
This patch relaxes the restriction by allowing function arguments of type
'union' to be traced in verifier.
Reviewed-by: Amery Hung <ameryhung@gmail.com>
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/r/20250919044110.23729-2-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/linux/bpf.h')
| -rw-r--r-- | include/linux/bpf.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h index a2ab51fa8b0a..ba3a3be7eb2a 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1128,7 +1128,7 @@ struct bpf_prog_offload { */ #define MAX_BPF_FUNC_REG_ARGS 5 -/* The argument is a structure. */ +/* The argument is a structure or a union. */ #define BTF_FMODEL_STRUCT_ARG BIT(0) /* The argument is signed. */ |