error calling TypeDeclaration: Struct:"blkgq_entry": field 0: type *btf.Pointer: not supported

[alahaiyo]

blkgq_entry is a structure defined in my c code ：
struct blkgq_entry {
struct blkcg_gq *blkgq;
struct cgroup *cgroup;
struct gendisk *disk;
}
go:generate：
//go:generate go run github.com/cilium/ebpf/cmd/bpf2go -cc clang FreezeCount ../../../../bpf/io/freeze_count.c -- -I../../../. ./bpf/include -D__TARGET_ARCH_x86

Run go generate -x after which an error will be reported:
Error: can't write /root/freezecount_bpfeb.go: can't generate types: template: common:19:4: executing "common" at <$.TypeDeclaration>: error calling TypeDeclaration: Struct:"blkgq_entry": field 0: type *btf.Pointer: not supported

I remember that on ebpfv0.7.0 it was fine, on ebpfv0.9.0 it reports an error

[lmb]

Can you double check that old versions worked? I don't think we ever supported generating pointer types.

What do you want to do with blkgq_entry->disk in Go? There is no way to share pointers between Go and eBPF, which is why you currently can't generate a type for such structs.

P.S.: Please pass -target amd64 to bpf2go instead of -D__TARGET_ARCH_x86.

[alahaiyo]

Thanks! I use the value of the pointer as the key and I should have defined this as u64.