linux-kernel - Re: [RFC PATCH 3/9] arm64: allocate sys

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Message-ID: <20150902101049.GE25720@arm.com>
Date:	Wed, 2 Sep 2015 11:10:50 +0100
From:	Will Deacon <will.deacon@....com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>
Subject: Re: [RFC PATCH 3/9] arm64: allocate sys_membarrier system call number

On Thu, Aug 27, 2015 at 06:56:49PM +0100, Mathieu Desnoyers 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. ]
> 
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> CC: linux-api@...r.kernel.org
> CC: Catalin Marinas <catalin.marinas@....com>
> CC: Will Deacon <will.deacon@....com>
> ---
>  arch/arm64/include/asm/unistd32.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
> index cef934a..d97be80 100644
> --- a/arch/arm64/include/asm/unistd32.h
> +++ b/arch/arm64/include/asm/unistd32.h
> @@ -797,3 +797,5 @@ __SYSCALL(__NR_memfd_create, sys_memfd_create)
>  __SYSCALL(__NR_bpf, sys_bpf)
>  #define __NR_execveat 387
>  __SYSCALL(__NR_execveat, compat_sys_execveat)
> +#define __NR_membarrier 388
> +__SYSCALL(__NR_membarrier, sys_membarrier)

I think people have made similar comments for other architectures, but
please also updated __NR_compat_syscalls when adding new compat syscalls
here.

Will
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