[RFC PATCH 1/9] powerpc: allocate sys_membarrier system call number

[Michael Ellerman]

On Thu, 2015-08-27 at 13:56 -0400, Mathieu Desnoyers wrote:
> Allow it to be used from SPU, since it should not have unwanted
> side-effects.
> 
> [ Untested on this architecture. To try it out: fetch linux-next/akpm,
>   apply this patch, build/run a membarrier-enabled kernel, and do make
>   kselftest. ]
> 
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
> CC: Andrew Morton <akpm at linux-foundation.org>
> CC: linux-api at vger.kernel.org
> CC: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> CC: Paul Mackerras <paulus at samba.org>
> CC: Michael Ellerman <mpe at ellerman.id.au>
> CC: linuxppc-dev at lists.ozlabs.org

Thanks.

I get:

$ ./membarrier_test
membarrier MEMBARRIER_CMD_QUERY syscall available.
membarrier: MEMBARRIER_CMD_SHARED success.
membarrier: tests done!

Which looks good.

Assuming the membarrier support hits 4.3, I'll take this via my tree for 4.3
also.

cheers