Replace "__auto_type" with "auto" #9327
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added 7 commits
July 20, 2025 09:42
"auto" was defined as a keyword back in the K&R days, but as a storage type specifier. No one ever used it, since it was and is the default storage type for local variables. C++11 recycled the keyword to allow a type to be declared based on the type of an initializer. This was finally adopted into standard C in C23. gcc and clang provide the "__auto_type" alias keyword as an extension for pre-C23, however, there is no reason to pollute the bulk of the source base with this temporary keyword; instead define "auto" as a macro unless the compiler is running in C23+ mode. This macro is added in <linux/compiler_types.h> because that header is included in some of the tools headers, wheres <linux/compiler.h> is not as it has a bunch of very kernel-specific things in it. Signed-off-by: H. Peter Anvin (Intel) <[email protected]> Acked-by: Miguel Ojeda <[email protected]>
Replace instances of "__auto_type" with "auto" in include/linux. Signed-off-by: H. Peter Anvin (Intel) <[email protected]>
Replace use of "__auto_type" in fs/proc/inode.c with "const auto". Suggested-by: Alexey Dobriyan <[email protected]> Signed-off-by: H. Peter Anvin (Intel) <[email protected]> Reviewed-by: Alexey Dobriyan <[email protected]>
Replace uses of "__auto_type" in arch/nios2/include/asm/uaccess.h with "auto", and equivalently convert an adjacent cast to the analogous form. Suggested-by: Linus Torvalds <[email protected]> Signed-off-by: H. Peter Anvin (Intel) <[email protected]>
Replace instances of "__auto_type" with "auto" in: arch/x86/include/asm/bug.h arch/x86/include/asm/string_64.h arch/x86/include/asm/uaccess_64.h Signed-off-by: H. Peter Anvin (Intel) <[email protected]>
Replace instances of "__auto_type" with "auto" in: tools/testing/selftests/bpf/prog_tests/socket_helpers.h This file does not seem to be including <linux/compiler_types.h> directly or indirectly, so copy the definition but guard it with !defined(auto). Signed-off-by: H. Peter Anvin (Intel) <[email protected]>
Replace one instance of "__auto_type" with "auto" in: tools/virtio/linux/compiler.h This file *does* include <linux/compiler_types.h> directly, so there is no need to duplicate the definition. Signed-off-by: H. Peter Anvin (Intel) <[email protected]>
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Pull request for series with
subject: Replace "__auto_type" with "auto"
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=983885