From: Ilya Leoshkevich iii@linux.ibm.com
mainline inclusion from mainline-5.13-rc1 commit 6be6a0baffc1357b6d2023155753f111624c4fec category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I5Q927 CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
-------------------------------------------------
Also document the expansion of the kind bitfield.
Signed-off-by: Ilya Leoshkevich iii@linux.ibm.com Signed-off-by: Alexei Starovoitov ast@kernel.org Acked-by: Yonghong Song yhs@fb.com Link: https://lore.kernel.org/bpf/20210226202256.116518-11-iii@linux.ibm.com (cherry picked from commit 6be6a0baffc1357b6d2023155753f111624c4fec) Signed-off-by: Wang Yufen wangyufen@huawei.com
Conflicts: Documentation/bpf/btf.rst --- Documentation/bpf/btf.rst | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/Documentation/bpf/btf.rst b/Documentation/bpf/btf.rst index 183f398c68d6..d0ec40d00c28 100644 --- a/Documentation/bpf/btf.rst +++ b/Documentation/bpf/btf.rst @@ -84,6 +84,7 @@ sequentially and type id is assigned to each recognized type starting from id #define BTF_KIND_FUNC_PROTO 13 /* Function Proto */ #define BTF_KIND_VAR 14 /* Variable */ #define BTF_KIND_DATASEC 15 /* Section */ + #define BTF_KIND_FLOAT 16 /* Floating point */ #define BTF_KIND_DECL_TAG 17 /* Decl Tag */ #define BTF_KIND_TYPE_TAG 18 /* Type Tag */
@@ -97,8 +98,8 @@ Each type contains the following common data:: /* "info" bits arrangement * bits 0-15: vlen (e.g. # of struct's members) * bits 16-23: unused - * bits 24-27: kind (e.g. int, ptr, array...etc) - * bits 28-30: unused + * bits 24-28: kind (e.g. int, ptr, array...etc) + * bits 29-30: unused * bit 31: kind_flag, currently used by * struct, union and fwd */ @@ -454,6 +455,18 @@ map definition. * ``offset``: the in-section offset of the variable * ``size``: the size of the variable in bytes
+2.2.16 BTF_KIND_FLOAT +~~~~~~~~~~~~~~~~~~~~~ + +``struct btf_type`` encoding requirement: + * ``name_off``: any valid offset + * ``info.kind_flag``: 0 + * ``info.kind``: BTF_KIND_FLOAT + * ``info.vlen``: 0 + * ``size``: the size of the float type in bytes: 2, 4, 8, 12 or 16. + +No additional type data follow ``btf_type``. + 2.2.17 BTF_KIND_DECL_TAG ~~~~~~~~~~~~~~~~~~~~~~~~