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Will Deacon 9238fa35a3 Revert "arm64: acpi: Enable ACPI CCEL support" 
This reverts commit d02c2e45b1.

Mauro reports that this breaks APEI notifications on his QEMU setup
because the "reserved for firmware" region still needs to be writable
by Linux in order to signal _back_ to the firmware after processing
the reported error:

  | {1}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 1
  | ...
  | [Firmware Warn]: GHES: Unhandled processor error type 0x02: cache error
  | Unable to handle kernel write to read-only memory at virtual address ffff800080035018
  | Mem abort info:
  |   ESR = 0x000000009600004f
  |   EC = 0x25: DABT (current EL), IL = 32 bits
  |   SET = 0, FnV = 0
  |   EA = 0, S1PTW = 0
  |   FSC = 0x0f: level 3 permission fault
  | Data abort info:
  |   ISV = 0, ISS = 0x0000004f, ISS2 = 0x00000000
  |   CM = 0, WnR = 1, TnD = 0, TagAccess = 0
  |   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
  | swapper pgtable: 4k pages, 52-bit VAs, pgdp=00000000505d7000
  | pgd=10000000510bc003, p4d=1000000100229403, pud=100000010022a403, pmd=100000010022b403, pte=0060000139b90483
  | Internal error: Oops: 000000009600004f [#1]  SMP

For now, revert the offending commit. We can presumably switch back to
PAGE_KERNEL when bringing this back in the future.

Link: https://lore.kernel.org/r/20251121224611.07efa95a@foz.lan
Reported-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
History 2025-11-24 13:14:50 +00:00
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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 reStructuredText 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.