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

Zhou Wang
2021-02-09T09:31:07Z

On 2021/2/8 5:51, Arnd Bergmann wrote:
> On Sun, Feb 7, 2021 at 9:18 AM Zhou Wang <wangzhou1@hisilicon.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
>
> .
>