[PATCH v2] ARM: Define wfi() macro for v6 processors

On Tuesday 08 February 2011 17:25:16 Russell King - ARM Linux wrote:

On Tue, Feb 08, 2011 at 04:15:15PM +0100, Arnd Bergmann wrote:

quoted

But that doesn't work if you build a combined v5/v6/v7 kernel, because
v5 supports neither form, right? I think to do that, it needs the
same kind of abstraction that we have for a number of other things
like cache management in arch/arm/mm/.

The options are kernels which support v3-v5 or v6-v7.  There's too big
a change between v5 and v6 to combine those into one kernel.

Ah, good to know. I never realized this with the common binary discussions.
Building for the versatile/realview platform makes it possible to select
any of ARM926 and the v6/v6k/v7 CPUs, as well as ARM7TDMI in the same
kernel config, so I assumed that this was actually a valid configuration
aside from bugs.

Would an attempt to make a combined v5/v6 kernel result in unacceptably
bad code, or is this just too much work for anyone to be bothered with
and little practical value?

	Arnd