Re: [PATCH v2] linux/kconfig.h: replace IF_ENABLED() with PTR_IF() in <linux/kernel.h>

[Kees Cook <keescook@xxxxxxxxxxxx>]

On Thu, May 06, 2021 at 02:45:15AM +0900, Masahiro Yamada wrote:
> <linux/kconfig.h> is included from all the kernel-space source files,
> including C, assembly, linker scripts. It is intended to contain a
> minimal set of macros to evaluate CONFIG options.
> 
> IF_ENABLED() is an intruder here because (x ? y : z) is C code, which
> should not be included from assembly files or linker scripts.
> 
> Also, <linux/kconfig.h> is no longer self-contained because NULL is
> defined in <linux/stddef.h>.
> 
> Move IF_ENABLED() out to <linux/kernel.h> as PTR_IF(). PTF_IF()
> takes the general boolean expression instead of a CONFIG option
> so that it fits better in <linux/kernel.h>.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>

Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>

-- 
Kees Cook