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SubjectRe: [PATCH] kbuild: move <linux/compiler_types.h> out of <linux/kconfig.h>
On Tue, Mar 27, 2018 at 7:40 PM, Masahiro Yamada
<yamada.masahiro@socionext.com> wrote:
> Since commit 28128c61e08e ("kconfig.h: Include compiler types to avoid
> missed struct attributes"), <linux/kconfig.h> pulls in kernel-space
> headers to unrelated file.
>
> Commit 0f9da844d877 ("MIPS: boot: Define __ASSEMBLY__ for its.S build")
> suppressed the build error by defining __ASSEMBLY__, but ITS (i.e. DTS)
> is not assembly, and should not include <linux/compiler_types.h> in the
> first place.
>
> Looking at arch/s390/tools/Makefile, host programs gen_facilities and
> gen_opcode_table now pull in <linux/compiler_types.h> as well.
>
> The motivation for that commit was to define necessary attributes
> before any struct is defined. Obviously, this happens only in C.
>
> It is enough to include <linux/compiler_types.h> only when compiling
> C files, and only when compiling kernel space.
>
> Move the <linux/compiler_types.h> inclusion to c_flags.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> ---
>
> I will also send a correct fix-up for MIPS Makefile later.

As long as the result is the same: it's impossible to define a
structure without defined attributes, I'm fine with it. :)

Question below...

>
>
>
> include/linux/kconfig.h | 3 ---
> scripts/Makefile.lib | 1 +
> 2 files changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/include/linux/kconfig.h b/include/linux/kconfig.h
> index dcde947..cc8fa10 100644
> --- a/include/linux/kconfig.h
> +++ b/include/linux/kconfig.h
> @@ -70,7 +70,4 @@
> */
> #define IS_ENABLED(option) __or(IS_BUILTIN(option), IS_MODULE(option))
>
> -/* Make sure we always have all types and struct attributes defined. */
> -#include <linux/compiler_types.h>
> -
> #endif /* __LINUX_KCONFIG_H */
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index c114ce5..07d0740 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -152,6 +152,7 @@ __cpp_flags = $(call flags,_cpp_flags)
> endif
>
> c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
> + -include $(srctree)/include/linux/compiler_types.h \

Why here instead of adding it to LINUXINCLUDE ?

> $(__c_flags) $(modkern_cflags) \
> $(basename_flags) $(modname_flags)
>
> --
> 2.7.4
>

-Kees

--
Kees Cook
Pixel Security

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