[PATCH v3 1/3] ARM: Introduce atomic MMIO modify

[Baruch Siach]

HI Ezequiel,

On Fri, Aug 23, 2013 at 07:24:03AM -0300, Ezequiel Garcia wrote:
> Some SoC have MMIO regions that are shared across orthogonal
> subsystems. This commit implements a possible solution for the
> thread-safe access of such regions through a spinlock-protected API.
> 
> Concurrent access is protected with a single spinlock for the
> entire MMIO address space. While this protects shared-registers,
> it also serializes access to unrelated/unshared registers.
> 
> We add relaxed and non-relaxed variants, by using writel_relaxed and writel,
> respectively. The rationale for this is that some users may not require
> register write completion but only thread-safe access to a register.
> 
> Signed-off-by: Ezequiel Garcia <ezequiel.garcia at free-electrons.com>

Is there a reason why this should be limited to ARM? I haven't found anything 
ARM specific in the code.

baruch

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