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

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Date:	Thu, 3 Sep 2015 15:38:58 +0000 (UTC)
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	Will Deacon <will.deacon@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-api <linux-api@...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 Sep 2, 2015, at 6:10 AM, Will Deacon will.deacon@....com wrote:

> 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.

Thanks for pointing it out! I'm fixing it for the next
RFC round.

Mathieu

> 
> Will

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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