linux-kernel - Re: [RFC PATCH v3 1/2] mempinfd: Add new syscall to provide memory pin

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Date:   Tue, 9 Feb 2021 17:27:30 +0800
From:   Zhou Wang <wangzhou1@...ilicon.com>
To:     Arnd Bergmann <arnd@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        Linux-MM <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "Linux API" <linux-api@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        gregkh <gregkh@...uxfoundation.org>,
        Barry Song <song.bao.hua@...ilicon.com>,
        "Jason Gunthorpe" <jgg@...pe.ca>, <kevin.tian@...el.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Eric Auger <eric.auger@...hat.com>,
        "Liguozhu (Kenneth)" <liguozhu@...ilicon.com>,
        Zhangfei Gao <zhangfei.gao@...aro.org>,
        Sihang Chen <chensihang1@...ilicon.com>
Subject: Re: [RFC PATCH v3 1/2] mempinfd: Add new syscall to provide memory
 pin

On 2021/2/8 5:51, Arnd Bergmann wrote:
> On Sun, Feb 7, 2021 at 9:18 AM Zhou Wang <wangzhou1@...ilicon.com> wrote:
> 
>> diff --git a/arch/arm64/include/asm/unistd32.h b/arch/arm64/include/asm/unistd32.h
>> index cccfbbe..3f49529 100644
>> --- a/arch/arm64/include/asm/unistd32.h
>> +++ b/arch/arm64/include/asm/unistd32.h
>> @@ -891,6 +891,8 @@ __SYSCALL(__NR_faccessat2, sys_faccessat2)
>>  __SYSCALL(__NR_process_madvise, sys_process_madvise)
>>  #define __NR_epoll_pwait2 441
>>  __SYSCALL(__NR_epoll_pwait2, compat_sys_epoll_pwait2)
>> +#define __NR_mempinfd 442
>> +__SYSCALL(__NR_mempinfd, sys_mempinfd)
> 
> This adds a compat syscall for 32-bit tasks running on arm64 without adding
> the same for the native arch/arm syscall table. Those two need to always
> stay synchronized. In fact, new system call should ideally get assigned
> on all architectures at the same time, with the same number (or +110
> on arch/alpha).

Thank for pointing out this. I use an ARM64 machine to test, so
currently only add it for ARM64 :)

Best,
Zhou

> 
>          Arnd
> 
> .
>