[PATCH 02/18] compiler.h: Split {READ, WRITE}_ONCE definitions out into rwonce.h

[Arnd Bergmann]

On Tue, Jun 30, 2020 at 7:37 PM Will Deacon <will at kernel.org> wrote:
>
> In preparation for allowing architectures to define their own
> implementation of the READ_ONCE() macro, move the generic
> {READ,WRITE}_ONCE() definitions out of the unwieldy 'linux/compiler.h'
> file and into a new 'rwonce.h' header under 'asm-generic'.
>
> Acked-by: Paul E. McKenney <paulmck at kernel.org>
> Signed-off-by: Will Deacon <will at kernel.org>
> ---
>  include/asm-generic/Kbuild   |  1 +
>  include/asm-generic/rwonce.h | 91 ++++++++++++++++++++++++++++++++++++
>  include/linux/compiler.h     | 83 +-------------------------------

Very nice, this has the added benefit of allowing us to stop including
asm/barrier.h once linux/compiler.h gets changed to not include
asm/rwonce.h.

The asm/barrier.h header has a circular dependency, pulling in
linux/compiler.h itself.

       Arnd