Commit 6789ab96 authored by Hao Luo's avatar Hao Luo Committed by Alexei Starovoitov
Browse files

compiler_types: Refactor the use of btf_type_tag attribute. 



Previous patches have introduced the compiler attribute btf_type_tag for
__user and __percpu. The availability of this attribute depends on
some CONFIGs and compiler support. This patch refactors the use
of btf_type_tag by introducing BTF_TYPE_TAG, which hides all the
dependencies.

No functional change.

Suggested-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Signed-off-by: default avatarHao Luo <haoluo@google.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarYonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20220310211655.3173786-1-haoluo@google.com
parent a77c2cfd

include/linux/compiler_types.h

+9 −10
Original line number Diff line number Diff line
@@ -4,6 +4,13 @@ 


#ifndef __ASSEMBLY__



#if defined(CONFIG_DEBUG_INFO_BTF) && defined(CONFIG_PAHOLE_HAS_BTF_TAG) && \

	__has_attribute(btf_type_tag)

# define BTF_TYPE_TAG(value) __attribute__((btf_type_tag(#value)))

#else

# define BTF_TYPE_TAG(value) /* nothing */

#endif



#ifdef __CHECKER__

/* address spaces */

# define __kernel	__attribute__((address_space(0)))
@@ -31,19 +38,11 @@ static inline void __chk_io_ptr(const volatile void __iomem *ptr) { } 
# define __kernel

# ifdef STRUCTLEAK_PLUGIN

#  define __user	__attribute__((user))

# elif defined(CONFIG_DEBUG_INFO_BTF) && defined(CONFIG_PAHOLE_HAS_BTF_TAG) && \

	__has_attribute(btf_type_tag)

#  define __user	__attribute__((btf_type_tag("user")))

# else

#  define __user

#  define __user	BTF_TYPE_TAG(user)

# endif

# define __iomem

# if defined(CONFIG_DEBUG_INFO_BTF) && defined(CONFIG_PAHOLE_HAS_BTF_TAG) && \

	__has_attribute(btf_type_tag)

#  define __percpu	__attribute__((btf_type_tag("percpu")))

# else

#  define __percpu

# endif

# define __percpu	BTF_TYPE_TAG(percpu)

# define __rcu

# define __chk_user_ptr(x)	(void)0

# define __chk_io_ptr(x)	(void)0