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From: Arnd Bergmann <arnd@kernel.org>
To: Zhou Wang <wangzhou1@hisilicon.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	 "open list:IOMMU DRIVERS" <iommu@lists.linux-foundation.org>,
	Linux-MM <linux-mm@kvack.org>,
	 Linux ARM <linux-arm-kernel@lists.infradead.org>,
	 Linux API <linux-api@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	 Alexander Viro <viro@zeniv.linux.org.uk>,
	gregkh <gregkh@linuxfoundation.org>,
	 Barry Song <song.bao.hua@hisilicon.com>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	kevin.tian@intel.com,
	 Jean-Philippe Brucker <jean-philippe@linaro.org>,
	Eric Auger <eric.auger@redhat.com>,
	 "Liguozhu (Kenneth)" <liguozhu@hisilicon.com>,
	Zhangfei Gao <zhangfei.gao@linaro.org>,
	 Sihang Chen <chensihang1@hisilicon.com>
Subject: Re: [RFC PATCH v3 1/2] mempinfd: Add new syscall to provide memory pin
Date: Sun, 7 Feb 2021 22:51:08 +0100	[thread overview]
Message-ID: <CAK8P3a13aGbqvTxL+5OQxu-wPa6RDHQJkJ_n8O6YeOibbJQ2yg@mail.gmail.com> (raw)
In-Reply-To: <1612685884-19514-2-git-send-email-wangzhou1@hisilicon.com>

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).

         Arnd


  parent reply	other threads:[~2021-02-07 21:51 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-07  8:18 [RFC PATCH v3 0/2] mempinfd: Add new syscall to provide memory pin Zhou Wang
2021-02-07  8:18 ` [RFC PATCH v3 1/2] " Zhou Wang
2021-02-07 21:34   ` Matthew Wilcox
2021-02-07 22:24     ` Song Bao Hua (Barry Song)
2021-02-08  1:30       ` Matthew Wilcox
2021-02-08  2:27         ` Song Bao Hua (Barry Song)
2021-02-08  3:46           ` Hillf Danton
2021-02-08  8:21           ` David Hildenbrand
2021-02-08 10:13             ` Song Bao Hua (Barry Song)
2021-02-08 10:37               ` David Hildenbrand
2021-02-08 20:52                 ` Song Bao Hua (Barry Song)
2021-02-08  2:18       ` David Rientjes
2021-02-08  5:34         ` Song Bao Hua (Barry Song)
2021-02-09  9:02     ` Zhou Wang
2021-02-07 21:51   ` Arnd Bergmann [this message]
2021-02-09  9:27     ` Zhou Wang
2021-02-07 22:02   ` Andy Lutomirski
2021-02-09  9:17     ` Zhou Wang
2021-02-09  9:37       ` Greg KH
2021-02-09 11:58         ` Zhou Wang
2021-02-09 12:01           ` Greg KH
2021-02-09 12:20             ` Zhou Wang
2021-02-10 18:50               ` Matthew Wilcox
2021-02-08  8:14   ` David Hildenbrand
2021-02-08 18:33     ` Jason Gunthorpe
2021-02-08 20:35       ` Song Bao Hua (Barry Song)
2021-02-08 21:30         ` Jason Gunthorpe
2021-02-09  3:01           ` Song Bao Hua (Barry Song)
2021-02-09 13:53             ` Jason Gunthorpe
2021-02-09 22:22               ` Song Bao Hua (Barry Song)
2021-02-10 18:04                 ` Jason Gunthorpe
2021-02-10 21:39                   ` Song Bao Hua (Barry Song)
2021-02-11 10:28                     ` David Hildenbrand
2021-02-07  8:18 ` [RFC PATCH v3 2/2] selftests/vm: add mempinfd test Zhou Wang

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