[PATCHv4 00/17] arm64: remove set_fs() and friends

[Mark Rutland]

Building atop Christoph's core rework now in v5.10-rc1, this series removes
set_fs() from arm64. The series can be found in arm64/set_fs-removal branch
[1].

Since v1 [2]:
* Remove redundant kthread init code
* Remove vestigal bit left by v1
* Rework SDEI entry
* Comment head.S better
* Fix commit message typos

Since v2 [3]:
* Rebase to v5.10-rc1
* Handle new MTE uaccess asm
* Fix trivial conflict with spectre mitigation rework
* Cleanup commit messages

Since v3 [4]:
* Rebase to v5.10-rc3 (trivial)
* Fix __get_kernel_nofault / __put_kernel_nofault error handling
* Fix include in mte asm
* Fix which patches change includes
* Fix typos

I've given v4 light boot + userspace testing.  As v2 had seen some light
testing with LTP (both native and compat), and Syzkaller (native only) I'm not
expecting any major issues, but I will be giving this some extended soak
testing just in case.

Catalin, Will, I'd like to get this into next ASAP so that it can soak for a
while. There is a trivial conflict with for-next/lto that git doesn't seem
smart enough to resolve automatically despite our attempts to make this easy.
The right thing to do is take Will's version of asm/alternative.h (which
deletes the macros that got moved elsewhere), and my version of
asm/asm-uaccess.h (which leaves the trivial ldtr/sttr helpers).

Thanks,
Mark.

[1] git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/set_fs-removal
[2] https://lore/kernel.org/r/20200925160722.27155-1-mark.rutland@arm.com
[3] https://lore/kernel.org/r/20201006144642.12195-1-mark.rutland@arm.com
[4] https://lore/kernel.org/r/20201026133156.44186-1-mark.rutland@arm.com

Mark Rutland (17):
  arm64: ensure ERET from kthread is illegal
  arm64: add C wrappers for SET_PSTATE_*()
  arm64: head.S: rename el2_setup -> init_kernel_el
  arm64: head.S: cleanup SCTLR_ELx initialization
  arm64: head.S: always initialize PSTATE
  arm64: sdei: move uaccess logic to arch/arm64/
  arm64: sdei: explicitly simulate PAN/UAO entry
  arm64: uaccess: move uao_* alternatives to asm-uaccess.h
  arm64: uaccess: rename privileged uaccess routines
  arm64: uaccess: simplify __copy_user_flushcache()
  arm64: uaccess: refactor __{get,put}_user
  arm64: uaccess: split user/kernel routines
  arm64: uaccess cleanup macro naming
  arm64: uaccess: remove set_fs()
  arm64: uaccess: remove addr_limit_user_check()
  arm64: uaccess: remove redundant PAN toggling
  arm64: uaccess: remove vestigal UAO support

 arch/arm64/Kconfig                   |  22 -----
 arch/arm64/include/asm/alternative.h |  59 ------------
 arch/arm64/include/asm/asm-uaccess.h |  29 ++++++
 arch/arm64/include/asm/cpucaps.h     |   2 -
 arch/arm64/include/asm/cpufeature.h  |  22 ++++-
 arch/arm64/include/asm/exec.h        |   1 -
 arch/arm64/include/asm/futex.h       |   8 +-
 arch/arm64/include/asm/processor.h   |   4 +-
 arch/arm64/include/asm/ptrace.h      |   8 +-
 arch/arm64/include/asm/sysreg.h      |  22 +++--
 arch/arm64/include/asm/thread_info.h |  10 +-
 arch/arm64/include/asm/uaccess.h     | 174 +++++++++++++++--------------------
 arch/arm64/kernel/armv8_deprecated.c |   4 +-
 arch/arm64/kernel/asm-offsets.c      |   3 +-
 arch/arm64/kernel/cpufeature.c       |  34 +------
 arch/arm64/kernel/entry.S            |  19 +---
 arch/arm64/kernel/head.S             |  51 ++++++----
 arch/arm64/kernel/process.c          |  29 ++----
 arch/arm64/kernel/proton-pack.c      |   4 +-
 arch/arm64/kernel/sdei.c             |  22 +++--
 arch/arm64/kernel/signal.c           |   3 -
 arch/arm64/kernel/sleep.S            |   2 +-
 arch/arm64/kernel/suspend.c          |   1 -
 arch/arm64/lib/clear_user.S          |   8 +-
 arch/arm64/lib/copy_from_user.S      |   8 +-
 arch/arm64/lib/copy_in_user.S        |  16 ++--
 arch/arm64/lib/copy_to_user.S        |   8 +-
 arch/arm64/lib/mte.S                 |   6 +-
 arch/arm64/lib/uaccess_flushcache.c  |   4 +-
 arch/arm64/mm/fault.c                |   5 -
 arch/arm64/mm/proc.S                 |   2 +-
 drivers/firmware/arm_sdei.c          |  14 ---
 32 files changed, 242 insertions(+), 362 deletions(-)

-- 
2.11.0