From: Arnd Bergmann <arnd@xxxxxxxx> Hi Christoph, Russell, This is the rebased version of my ARM set_fs patches on top of v5.14-rc2. There were a couple of minor conflicts that I resolved, but otherwise this is still identical to the version I tested earlier. The one notable change this time is that I rename thread_info->syscall to thread_info->abi_syscall, to clarify that this field now contains both the ABI bits (0x900000 for OABI, 0x000000 for EABI) in kernels that support both, and every access to this has to mask out the bits it needs. As Russell mentioned before, having a 'syscall' field that not just contains the syscall number is confusing and error-prone, so I hope this change is good enough. I have tested the oabi-compat changes using the LTP tests for the three modified syscalls using an Armv7 kernel and a Debian 5 OABI user space. I also tested the syscall_get_nr() in all combinations of OABI/EABI kernel user space and fixed the bugs I found after Russell pointed out those issues in the early versions. Linus Walleij did additional testing of v4 on Footbridge with OABI user space. With this and the m68k changes getting merged, we are very close to eliminating set_fs completely. Russell, you can pull these from https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git arm-setfs_v5 or I can add them to the ARM patch tracker if you prefer. Arnd v4: https://lore.kernel.org/linux-arm-kernel/20201030154519.1245983-1-arnd@xxxxxxxxxx/ v3: https://lore.kernel.org/linux-arm-kernel/20201001141233.119343-1-arnd@xxxxxxxx/ v2: https://lore.kernel.org/linux-arm-kernel/20200918124624.1469673-1-arnd@xxxxxxxx/ v1: https://lore.kernel.org/linux-arm-kernel/20200907153701.2981205-1-arnd@xxxxxxxx/ Arnd Bergmann (9): mm/maccess: fix unaligned copy_{from,to}_kernel_nofault ARM: traps: use get_kernel_nofault instead of set_fs() ARM: oabi-compat: add epoll_pwait handler ARM: syscall: always store thread_info->abi_syscall ARM: oabi-compat: rework epoll_wait/epoll_pwait emulation ARM: oabi-compat: rework sys_semtimedop emulation ARM: oabi-compat: rework fcntl64() emulation ARM: uaccess: add __{get,put}_kernel_nofault ARM: uaccess: remove set_fs() implementation ARM: oabi-compat: fix oabi epoll sparse warning arch/arm/Kconfig | 1 - arch/arm/include/asm/ptrace.h | 1 - arch/arm/include/asm/syscall.h | 16 ++- arch/arm/include/asm/thread_info.h | 6 +- arch/arm/include/asm/uaccess-asm.h | 6 - arch/arm/include/asm/uaccess.h | 169 ++++++++++++----------- arch/arm/include/uapi/asm/unistd.h | 1 + arch/arm/kernel/asm-offsets.c | 3 +- arch/arm/kernel/entry-common.S | 20 +-- arch/arm/kernel/process.c | 7 +- arch/arm/kernel/ptrace.c | 14 +- arch/arm/kernel/signal.c | 8 -- arch/arm/kernel/sys_oabi-compat.c | 214 +++++++++++++++++------------ arch/arm/kernel/traps.c | 47 +++---- arch/arm/lib/copy_from_user.S | 3 +- arch/arm/lib/copy_to_user.S | 3 +- arch/arm/tools/syscall.tbl | 2 +- fs/eventpoll.c | 5 +- include/linux/eventpoll.h | 18 +++ include/linux/syscalls.h | 3 + ipc/sem.c | 84 ++++++----- mm/maccess.c | 28 +++- 22 files changed, 361 insertions(+), 298 deletions(-) Cc: linux-kernel@xxxxxxxxxxxxxxx Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx Cc: linux-arch@xxxxxxxxxxxxxxx Cc: linux-mm@xxxxxxxxx Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx> Cc: Linus Walleij <linus.walleij@xxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> -- 2.29.2
