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

From: Christoph Lameter
Date: Wed Aug 02 2006 - 20:27:23 EST

On Wed, 2 Aug 2006, Jeremy Fitzhardinge wrote:

> Add "always lock'd" implementations of set_bit, clear_bit and
> change_bit and the corresponding test_and_ functions. Also add
> "always lock'd" implementation of cmpxchg. These give guaranteed
> strong synchronisation and are required for non-SMP kernels running on
> an SMP hypervisor.

I think I asked this before....

Would it not be simpler to always use the locked implementation on UP? At
least when the kernel is compiled with hypervisor support? This is going
to add yet another series of bit operations.

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