locking: Move mcs_spinlock.h into kernel/locking/
The mcs_spinlock code is not meant (or suitable) as a generic locking primitive, therefore take it away from the normal includes and place it in kernel/locking/. This way the locking primitives implemented there can use it as part of their implementation but we do not risk it getting used inapropriately. Signed-off-by: NPeter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/n/tip-byirmpamgr7h25m5kyavwpzx@git.kernel.orgSigned-off-by: NIngo Molnar <mingo@kernel.org>
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