On Wed, Aug 23, 2017 at 01:53:16PM -0700, Paul Burton wrote: > The generic MIPS implementations of halting, powering down or restarting > the system all hang using a busy loop as a last resort. We have many > platforms which avoid this loop by implementing their own, many using > some variation upon executing a wait instruction to lower CPU power > usage if we reach this point. > > In order to prepare for cleaning up these various custom implementations > of the same thing, this patch makes the generic machine_halt(), > machine_power_off() & machine_restart() functions each make use of the > wait instruction to lower CPU power usage in cases where we know that > the wait instruction is available. If wait isn't known to be supported > then we fall back to calling cpu_wait(), and if we don't have a > cpu_wait() callback then we effectively continue using a busy loop. > > In effect the new machine_hang() function provides a superset of the > functionality that the various platforms currently provide differing > subsets of. > > Signed-off-by: Paul Burton <paul.burton@xxxxxxxxxx> > Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx> > Cc: linux-mips@xxxxxxxxxxxxxx I've applied this patch (but not patch 2) for 4.17. Thanks James
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