diff options
| author | Hao Luo <haoluo@google.com> | 2020-09-30 02:50:47 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-10-03 01:00:49 +0300 |
| commit | eaa6bcb71ef6ed3dc18fc525ee7e293b06b4882b (patch) | |
| tree | f942e4cd04a29b8f50ec5a57db535da79fcdd068 /include/linux/btf.h | |
| parent | 2c2f6abeff1322a61f5ad7ce0ecccabf53e4fad5 (diff) | |
| download | linux-eaa6bcb71ef6ed3dc18fc525ee7e293b06b4882b.tar.xz | |
bpf: Introduce bpf_per_cpu_ptr()
Add bpf_per_cpu_ptr() to help bpf programs access percpu vars.
bpf_per_cpu_ptr() has the same semantic as per_cpu_ptr() in the kernel
except that it may return NULL. This happens when the cpu parameter is
out of range. So the caller must check the returned value.
Signed-off-by: Hao Luo <haoluo@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200929235049.2533242-5-haoluo@google.com
Diffstat (limited to 'include/linux/btf.h')
| -rw-r--r-- | include/linux/btf.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/btf.h b/include/linux/btf.h index af1244180588..2bf641829664 100644 --- a/include/linux/btf.h +++ b/include/linux/btf.h @@ -110,6 +110,11 @@ btf_resolve_size(const struct btf *btf, const struct btf_type *type, i < btf_type_vlen(struct_type); \ i++, member++) +#define for_each_vsi(i, datasec_type, member) \ + for (i = 0, member = btf_type_var_secinfo(datasec_type); \ + i < btf_type_vlen(datasec_type); \ + i++, member++) + static inline bool btf_type_is_ptr(const struct btf_type *t) { return BTF_INFO_KIND(t->info) == BTF_KIND_PTR; @@ -194,6 +199,12 @@ static inline const struct btf_member *btf_type_member(const struct btf_type *t) return (const struct btf_member *)(t + 1); } +static inline const struct btf_var_secinfo *btf_type_var_secinfo( + const struct btf_type *t) +{ + return (const struct btf_var_secinfo *)(t + 1); +} + #ifdef CONFIG_BPF_SYSCALL const struct btf_type *btf_type_by_id(const struct btf *btf, u32 type_id); const char *btf_name_by_offset(const struct btf *btf, u32 offset); |