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Code Issues Releases Wiki Activity

libbpf: Make __kptr and __kptr_ref unconditionally use btf_type_tag() attr 

It will be annoying and surprising for users of __kptr and __kptr_ref if
libbpf silently ignores them just because Clang used for compilation
didn't support btf_type_tag(). It's much better to get clear compiler
error than debug BPF verifier failures later on.

Fixes: ef89654f2b ("libbpf: Add kptr type tag macros to bpf_helpers.h")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220509004148.1801791-3-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2022-05-08 17:41:41 -07:00 committed by Daniel Borkmann
parent 1e2666e029
commit 8e2f618e8b
1 changed files with 0 additions and 5 deletions
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5
tools/lib/bpf/bpf_helpers.h
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@ -149,13 +149,8 @@ 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