linux-kernel - [PATCH v2 0/4] syscalls: remove compat_alloc_user

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Date:   Mon,  2 Nov 2020 13:31:47 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     linux-arch@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Eric Biederman <ebiederm@...ssion.com>,
        Ingo Molnar <mingo@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, kexec@...ts.infradead.org
Subject: [PATCH v2 0/4] syscalls: remove compat_alloc_user_space callers

From: Arnd Bergmann <arnd@...db.de>

Going through compat_alloc_user_space() to convert indirect system call
arguments tends to add complexity compared to handling the native and
compat logic in the same code.

I have patches for all other uses of compat_alloc_user_space() as well,
and would expect that we can subsequently remove the interface itself.

Changes in v2:

- address review comments from Christoph Hellwig
- split syscall removal into a separate patch
- replace __X32_COND_SYSCALL() with individual macros for x32

Arnd Bergmann (4):
  kexec: simplify compat_sys_kexec_load
  mm: simplify compat_sys_move_pages
  mm: simplify compat numa syscalls
  compat: remove some compat entry points

 arch/arm64/include/asm/unistd32.h         |  12 +-
 arch/mips/kernel/syscalls/syscall_n32.tbl |  12 +-
 arch/mips/kernel/syscalls/syscall_o32.tbl |  12 +-
 arch/parisc/kernel/syscalls/syscall.tbl   |  10 +-
 arch/powerpc/kernel/syscalls/syscall.tbl  |  12 +-
 arch/s390/kernel/syscalls/syscall.tbl     |  12 +-
 arch/sparc/kernel/syscalls/syscall.tbl    |  12 +-
 arch/x86/entry/syscall_x32.c              |   2 +
 arch/x86/entry/syscalls/syscall_32.tbl    |   6 +-
 arch/x86/entry/syscalls/syscall_64.tbl    |   4 +-
 include/linux/compat.h                    |  26 ---
 include/linux/kexec.h                     |   2 -
 include/uapi/asm-generic/unistd.h         |  12 +-
 kernel/kexec.c                            |  90 ++++------
 kernel/sys_ni.c                           |   5 -
 mm/mempolicy.c                            | 195 +++++-----------------
 mm/migrate.c                              |  50 +++---
 17 files changed, 155 insertions(+), 319 deletions(-)

Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Christoph Hellwig <hch@...radead.org>
Cc: Eric Biederman <ebiederm@...ssion.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: "H . Peter Anvin" <hpa@...or.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-arch@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org
Cc: kexec@...ts.infradead.org
-- 
2.27.0