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

From: Michael Ellerman <[email-masked]>
Date: Mon, 31 Aug 2015 16:54:05 +1000

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 <[email-masked]>
> CC: Andrew Morton <[email-masked]>
> CC: [email-masked]
> CC: Benjamin Herrenschmidt <[email-masked]>
> CC: Paul Mackerras <[email-masked]>
> CC: Michael Ellerman <[email-masked]>
> CC: [email-masked]

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