powerpc/powernv: pr_warn_once on unsupported OPAL_MSG type

[Michael Ellerman]

On Fri, 2015-11-12 at 01:08:23 UTC, Stewart Smith wrote:
> When running on newer OPAL firmware that supports sending extra
> OPAL_MSG types, we would print a warning on *every* message received.
> 
> This could be a problem for kernels that don't support OPAL_MSG_OCC
> on machines that are running real close to thermal limits and the
> OCC is throttling the chip. For a kernel that is paying attention to
> the message queue, we could get these notifications quite often.
> 
> Conceivably, future message types could also come fairly often,
> and printing that we didn't understand them 10,000 times provides
> no further information than printing them once.
> 
> Cc: stable at vger.kernel.org
> Signed-off-by: Stewart Smith <stewart at linux.vnet.ibm.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/98da62b716a3b24ab8e77453

cheers