These attributes are supported by the BPF back end:
kernel_helper ¶This attribute applies to functions.
It indicates that the specified function declaration is a kernel helper. The helper function is passed as an argument to the attribute. Example:
int bpf_probe_read (void *dst, int size, const void *unsafe_ptr) __attribute__ ((kernel_helper (4)));
preserve_access_index ¶This attribute applies to types.
The preserve_access_index attribute supports
BPF Compile Once - Run Everywhere (CO-RE) support.
When attached to a
struct or union type definition, it indicates that CO-RE
relocation information should be generated for any access to a variable
of that type. The behavior is equivalent to manually
wrapping every such access with __builtin_preserve_access_index.