[PATCH 1/5] ARC: uapi: Stop leaking CONFIG_ARC_HAS_SWAPE reference to userspace

[Arnd Bergmann]

On Tue, Dec 30, 2025, at 08:10, Thomas Weißschuh wrote:
> UAPI headers are not supposed to leak references to kconfig symbols.
> These won't be set when building userspace. Hide the kconfig reference
> behind 'if defined(__KERNEL__)', so it will be stripped by
> headers_install.sh. The result for userspace will be the same, but the
> exception in headers_install.sh can also be removed.
>
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh at linutronix.de>

Acked-by: Arnd Bergmann <arnd at arndb.de>

Same as for the nios2 version, I think the nicer solution would
be to use the asm-generic header for uapi and move this one
to arch/arc/include/asm/swab.h for kernel-internal use.

In theory, using 'select ARCH_USE_BUILTIN_BSWAP' in Kconfig should
let the compiler pick the best swap instruction, which would
be even less code, but I'm not sure if there was a reason that
nios2 and arc don't already do this.

      Arnd