On Tue, Mar 28, 2017 at 02:35:13PM -0700, Matthew Wilcox wrote:

On Tue, Mar 28, 2017 at 06:15:41PM +0200, Dmitry Vyukov wrote:

quoted

The new header allows to wrap per-arch atomic operations
and add common functionality to all of them.

Why a new header instead of putting this in linux/atomic.h?

The idea was that doing it this way allowed architectures to switch over
to the arch_* naming without a flag day. Currently this only matters for
KASAN, which is only supported by a couple of architectures (arm64,
x86).

I seem to recall that there was an issue that prevented us from solving
this with ifdeffery early in linux/atomic.h like:

#ifdef arch_op
#define op(...) ({ 		\
	kasna_whatever(...)	\
	arch_op(...)		\
})
#endif

... but I can't recall specifically what it was.

Thanks,
Mark.

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