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Jia He 12064c1768 Revert "ACPI: Add memory semantics to acpi_os_map_memory()" This reverts commit `437b38c511`. The memory semantics added in commit `437b38c511` causes SystemMemory Operation region, whose address range is not described in the EFI memory map to be mapped as NormalNC memory on arm64 platforms (through acpi_os_map_memory() in acpi_ex_system_memory_space_handler()). This triggers the following abort on an ARM64 Ampere eMAG machine, because presumably the physical address range area backing the Opregion does not support NormalNC memory attributes driven on the bus. Internal error: synchronous external abort: 96000410 [#1] SMP Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.14.0+ #462 Hardware name: MiTAC RAPTOR EV-883832-X3-0001/RAPTOR, BIOS 0.14 02/22/2019 pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [...snip...] Call trace: acpi_ex_system_memory_space_handler+0x26c/0x2c8 acpi_ev_address_space_dispatch+0x228/0x2c4 acpi_ex_access_region+0x114/0x268 acpi_ex_field_datum_io+0x128/0x1b8 acpi_ex_extract_from_field+0x14c/0x2ac acpi_ex_read_data_from_field+0x190/0x1b8 acpi_ex_resolve_node_to_value+0x1ec/0x288 acpi_ex_resolve_to_value+0x250/0x274 acpi_ds_evaluate_name_path+0xac/0x124 acpi_ds_exec_end_op+0x90/0x410 acpi_ps_parse_loop+0x4ac/0x5d8 acpi_ps_parse_aml+0xe0/0x2c8 acpi_ps_execute_method+0x19c/0x1ac acpi_ns_evaluate+0x1f8/0x26c acpi_ns_init_one_device+0x104/0x140 acpi_ns_walk_namespace+0x158/0x1d0 acpi_ns_initialize_devices+0x194/0x218 acpi_initialize_objects+0x48/0x50 acpi_init+0xe0/0x498 If the Opregion address range is not present in the EFI memory map there is no way for us to determine the memory attributes to use to map it - defaulting to NormalNC does not work (and it is not correct on a memory region that may have read side-effects) and therefore commit `437b38c511` should be reverted, which means reverting back to the original behavior whereby address ranges that are mapped using acpi_os_map_memory() default to the safe devicenGnRnE attributes on ARM64 if the mapped address range is not defined in the EFI memory map. Fixes: `437b38c511` ("ACPI: Add memory semantics to acpi_os_map_memory()") Signed-off-by: Jia He <justin.he@arm.com> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>		2021-09-23 20:39:36 +02:00
arch	Revert "ACPI: Add memory semantics to acpi_os_map_memory()"	2021-09-23 20:39:36 +02:00
block	blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd	2021-09-15 12:03:18 -06:00
certs	certs: Add support for using elliptic curve keys for signing modules	2021-08-23 19:55:42 +03:00
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2021-08-30 12:57:10 -07:00
Documentation	Devicetree fixes for v5.15, take 2:	2021-09-18 12:40:55 -07:00
drivers	Revert "ACPI: Add memory semantics to acpi_os_map_memory()"	2021-09-23 20:39:36 +02:00
fs	iov_iter.3-5.15-2021-09-17	2021-09-17 09:23:44 -07:00
include	Revert "ACPI: Add memory semantics to acpi_os_map_memory()"	2021-09-23 20:39:36 +02:00
init	memblock: introduce saner 'memblock_free_ptr()' interface	2021-09-14 13:23:22 -07:00
ipc	ipc: remove memcg accounting for sops objects in do_semtimedop()	2021-09-14 10:22:11 -07:00
kernel	A single fix for the perf core where a value read with READ_ONCE() was	2021-09-19 13:22:40 -07:00
lib	pci_iounmap'2: Electric Boogaloo: try to make sense of it all	2021-09-19 17:13:35 -07:00
LICENSES	LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes"	2021-07-15 06:31:24 -06:00
mm	memblock: introduce saner 'memblock_free_ptr()' interface	2021-09-14 13:23:22 -07:00
net	Networking fixes for 5.15-rc2, including fixes from bpf.	2021-09-16 13:05:42 -07:00
samples	kgdb patches for 5.15	2021-09-07 12:08:04 -07:00
scripts	Kbuild fixes for v5.15	2021-09-19 12:55:12 -07:00
security	Kbuild updates for v5.15	2021-09-03 15:33:47 -07:00
sound	sound fixes for 5.15-rc1	2021-09-09 16:05:10 -07:00
tools	powerpc fixes for 5.15 #2	2021-09-19 13:00:23 -07:00
usr	.gitignore: prefix local generated files with a slash	2021-05-02 00:43:35 +09:00
virt	KVM: Drop unused kvm_dirty_gfn_invalid()	2021-09-06 08:23:46 -04:00
.clang-format	clang-format: Update with the latest for_each macro list	2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	.gitignore: ignore only top-level modules.builtin	2021-05-02 00:43:35 +09:00
.mailmap	mailmap: update email address of Matthias Fuchs and Thomas Körper	2021-08-19 09:39:44 +02:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: move Murali Karicheri to credits	2021-04-29 15:47:30 -07:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	MAINTAINERS: Add Nirmal Patel as VMD maintainer	2021-09-15 16:44:03 -05:00
Makefile	Linux 5.15-rc2	2021-09-19 17:28:22 -07:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

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.