On Mon, Jan 27, 2014 at 12:27:01PM -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. > > Cc: Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> > Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx> > Signed-off-by: Ezequiel Garcia <ezequiel.garcia@xxxxxxxxxxxxxxxxxx> > --- > Russell, > > Can you confirm this patch is on its way to v3.14? > ping? -- Ezequiel García, Free Electrons Embedded Linux, Kernel and Android Engineering http://free-electrons.com _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-arm-kernel