From: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Date: Mon, 25 Apr 2022 03:18:58 +0530
Subject: libbpf: Add kptr type tag macros to bpf_helpers.h
Patch-mainline: v5.19-rc1
Git-commit: ef89654f2bc7459f45b40be80de6cd3765ef8539
References: jsc#PED-1377

Include convenience definitions:
__kptr:	Unreferenced kptr
__kptr_ref: Referenced kptr

Users can use them to tag the pointer type meant to be used with the new
support directly in the map value definition.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220424214901.2743946-11-memxor@gmail.com
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
 tools/lib/bpf/bpf_helpers.h |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/tools/lib/bpf/bpf_helpers.h
+++ b/tools/lib/bpf/bpf_helpers.h
@@ -149,6 +149,13 @@ enum libbpf_tristate {
 
 #define __kconfig __attribute__((section(".kconfig")))
 #define __ksym __attribute__((section(".ksyms")))
+#if __has_attribute(btf_type_tag)
+#define __kptr __attribute__((btf_type_tag("kptr")))
+#define __kptr_ref __attribute__((btf_type_tag("kptr_ref")))
+#else
+#define __kptr
+#define __kptr_ref
+#endif
 
 #ifndef ___bpf_concat
 #define ___bpf_concat(a, b) a ## b