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Jamie Iles b9293d457f arm64/mm: remove now-superfluous ISBs from TTBR writes 
At the time of authoring 7655abb953 ("arm64: mm: Move ASID from TTBR0
to TTBR1"), the Arm ARM did not specify any ordering guarantees for
direct writes to TTBR0_ELx and TTBR1_ELx and so an ISB was required
after each write to ensure TLBs would only be populated from the
expected (or reserved tables).

In a recent update to the Arm ARM, the requirements have been relaxed to
reflect the implementation of current CPUs and required implementation
of future CPUs to read (RDYDPX in D8.2.3 Translation table base address
register):

  Direct writes to TTBR0_ELx and TTBR1_ELx occur in program order
  relative to one another, without the need for explicit
  synchronization. For any one translation, all indirect reads of
  TTBR0_ELx and TTBR1_ELx that are made as part of the translation
  observe only one point in that order of direct writes.

Remove the superfluous ISBs to optimize uaccess helpers and context
switch.

Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Jamie Iles <quic_jiles@quicinc.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20230613141959.92697-1-quic_jiles@quicinc.com
[catalin.marinas@arm.com: rename __cpu_set_reserved_ttbr0 to ..._nosync]
[catalin.marinas@arm.com: move the cpu_set_reserved_ttbr0_nosync() call to cpu_do_switch_mm()]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2023-06-15 17:47:54 +01:00
arch arm64/mm: remove now-superfluous ISBs from TTBR writes 2023-06-15 17:47:54 +01:00
block block: Deny writable memory mapping if block is read-only 2023-05-19 20:17:10 -06:00
certs KEYS: Add missing function documentation 2023-04-24 16:15:52 +03:00
crypto This push fixes the following problems: 2023-05-07 10:57:14 -07:00
Documentation ata fixes for 6.4-rc3 2023-05-21 11:46:23 -07:00
drivers fbdev fixes for kernel 6.4-rc3: 2023-05-21 11:13:23 -07:00
fs four ksmbd server fixes 2023-05-21 10:55:31 -07:00
include USB/Thunderbolt fixes for 6.4-rc3 2023-05-20 10:16:38 -07:00
init Objtool changes for v6.4: 2023-04-28 14:02:54 -07:00
io_uring for-6.4/io_uring-2023-05-07 2023-05-07 10:00:09 -07:00
ipc Merge branch 'work.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2023-02-24 19:20:07 -08:00
kernel Probes fixes for 6.4-rc1: 2023-05-18 09:04:45 -07:00
lib Eight hotfixes. Four are cc:stable, the other four are for post-6.4 2023-05-18 17:06:04 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm: fix zswap writeback race condition 2023-05-17 15:24:33 -07:00
net Networking fixes for 6.4-rc3, including fixes from can, xfrm, 2023-05-18 08:52:14 -07:00
rust Rust changes for v6.4 2023-04-30 11:20:22 -07:00
samples LoongArch changes for v6.4 2023-05-04 12:40:16 -07:00
scripts Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
security integrity-v6.4 2023-04-29 10:11:32 -07:00
sound ALSA: hda: Add NVIDIA codec IDs a3 through a7 to patch table 2023-05-17 16:57:43 +02:00
tools perf tools fixes for v6.4: 2023-05-21 13:24:59 -07:00
usr initramfs: Check negative timestamp to prevent broken cpio archive 2023-04-16 17:37:01 +09:00
virt KVM: Fix vcpu_array[0] races 2023-05-19 13:56:26 -04:00
.clang-format cxl for v6.4 2023-04-30 11:51:51 -07:00
.cocciconfig
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for *.dtso files 2023-02-26 15:28:23 +09:00
.gitignore linux-kselftest-kunit-6.4-rc1 2023-04-24 12:31:32 -07:00
.mailmap mailmap: add entries for Nikolay Aleksandrov 2023-05-17 09:35:05 +01:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: sctp: move Neil to CREDITS 2023-05-12 08:51:32 +01:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS sound fixes for 6.4-rc3 2023-05-19 10:55:55 -07:00
Makefile Linux 6.4-rc3 2023-05-21 14:05:48 -07:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.