libbpf: __arg_untrusted in bpf_helpers.h

Make btf_decl_tag("arg:untrusted") available for libbpf users via
macro. Makes the following usage possible:

  void foo(struct bar *p __arg_untrusted) { ... }
  void bar(struct foo *p __arg_trusted) {
    ...
    foo(p->buz->bar); // buz derefrence looses __trusted
    ...
  }

Acked-by: Kumar Kartikeya Dwivedi <[email protected]>
Signed-off-by: Eduard Zingerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

Author: eddyz87

tools/lib/bpf/bpf_helpers.h

@@ -215,6 +215,7 @@ enum libbpf_tristate {
 #define __arg_nonnull __attribute((btf_decl_tag("arg:nonnull")))
 #define __arg_nullable __attribute((btf_decl_tag("arg:nullable")))
 #define __arg_trusted __attribute((btf_decl_tag("arg:trusted")))
+#define __arg_untrusted __attribute((btf_decl_tag("arg:untrusted")))
 #define __arg_arena __attribute((btf_decl_tag("arg:arena")))
 
 #ifndef ___bpf_concat