On Thu, Jun 9, 2022 at 8:22 AM Théophile Dubuc <theophile.dubuc@xxxxxxxxxxx> wrote: > > Hello, > > I get errors when compiling my bpf application, because vmlinux.h seems to conflict with bpf.h. > If I include <bpf/bpf.h> or <bpf/libbpf.h>, I get tons of errors like vmlinux.h is included from BPF-side source code. While bpf/bpf.h and bpf/libbpf.h is included from user-space side. You shouldn't have an application including both at the same time. And then vmlinux.h is not compatible with most UAPI headers (that's a known limitation we are hopefully will solve eventually), but it defines all the kernel types down to __u32 alias, so you generally don't need other UAPI headers. > > > In file included from .output/bpf/libbpf.h:18: > > ../libbpf/include/uapi/linux/bpf.h:54:2: error: redefinition of enumerator 'BPF_REG_0' > > BPF_REG_0 = 0, > > ^ > > ../vmlinux/vmlinux.h:31938:2: note: previous definition is here > > BPF_REG_0 = 0, > > ^ > > > > What I'm trying to do is use the function `bpf_map_get_next_key` to find an entry in a hash table, and that function is defined in bpf.h. > I also tried using the `bpf_map__get_next_key` function from libbpf.h instead, but libbpf.h includes bpf.h so I get the conflicts anyway. > > I generated vmlinux.h using the `gen_vm_linux_h.sh` script from libbpf-bootstrap/tools, and my Makefile is also the one from the bootstrap example. > > > > I feel like I am missing something but I can't figure it out (I am quite new to bpf) even by looking in this mailing list archive. > If you have any idea of what's wrong, please let me know. > > > > Best regards, > > Théophile
