linux-kernel - Re: [RFC PATCH v2 7/9] arm64: allocate sys

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Message-ID: <20150916163945.GQ28771@arm.com>
Date:	Wed, 16 Sep 2015 17:39:45 +0100
From:	Will Deacon <will.deacon@....com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-api <linux-api@...r.kernel.org>
Subject: Re: [RFC PATCH v2 7/9] arm64: allocate sys_membarrier system call
 number

On Wed, Sep 16, 2015 at 05:38:04PM +0100, Mathieu Desnoyers wrote:
> ----- On Sep 16, 2015, at 12:35 PM, Will Deacon will.deacon@....com wrote:
> 
> > Hi Mathieu,
> > 
> > On Wed, Sep 16, 2015 at 04:18:39PM +0100, Mathieu Desnoyers wrote:
> >> ----- On Sep 7, 2015, at 12:15 PM, Mathieu Desnoyers
> >> mathieu.desnoyers@...icios.com wrote:
> >> 
> >> > arm64 sys_membarrier number is already wired for arm64 through
> >> > asm-generic/unistd.h, but needs to be allocated separately for
> >> > the 32-bit compability layer of arm64.
> >> > 
> >> > [ 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. ]
> >> 
> >> sys_membarrier has been merged into Linux 4.3-rc1. sys_membarrier can therefore
> >> be tested on top of Linus' master.
> > 
> > Just to say that I'm happy to merge this once arch/arm/ also has the
> > syscall wired up. It'd be a bit weird to have the support in the arm64
> > compat layer but not the arch/arm/ native kernel!
> 
> Sounds good! We're currently testing sys_membarrier on a wandboard. We'll
> provide feedback by replying to the ARM patch thread soon.

Ok. I was about to kick the selftest on my Juno board (arm64).

Will
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