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SubjectRe: [PATCH 1/3] make access_process_vm work on device memory
> urgh.
>
> We have HAVE_ARCH*
> We have __HAVE_ARCH*
> We have ARCH_HAS*
> We have __ARCH_HAS*
>
> what a mess.
>
> Probably the preferred (but still ugly) approach is to implement
> CONFIG_ARCH_*.
Only if it is a Kconfig symbol.

We have recently started to use 'HAVE_*' for boolean symbols used
to select a specific function for one architecture.
See arch/Kconfig for a few samples.

And Documentation/kbuild/kconfig-language.txt for usage hints.

Sam


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