[Xen-devel] Re: [patch 2/8] Implement always-locked bit ops, for memory shared with an SMP hypervisor.

[Chris Wright <chrisw@xxxxxxxxxxxx>]

* Christoph Lameter (clameter@xxxxxxx) wrote:
> An include <asm/xen-bitops.h> would need to fall back to asm-generic if
> there is no file in asm-arch/xen-bitops.h. I thought we had such a 
> mechanism?

While Xen is the primary user, it is a misnomer to call it xen-bitops.
These are simply always locked, hence the sync-bitops name.  Also,
there's a use of sync_cmpxchg, and cmpxchg is not in bitops.h.

As for the mechanism, it is manual.  Arch specific header includes
asm-generic one.

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