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Subject[PATCH v5 00/10] ARM: remove set_fs callers and implementation
From: Arnd Bergmann <>

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 arm-setfs_v5

or I can add them to the ARM patch tracker if you prefer.



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: Alexander Viro <>
Cc: Linus Walleij <>
Cc: Arnd Bergmann <>


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