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Gerald Schaefer 487ef5d4d9 s390/mm: Add PTE_MARKER support for hugetlbfs mappings 
Commit 8a13897fb0 ("mm: userfaultfd: support UFFDIO_POISON for
hugetlbfs") added support for PTE_MARKER_POISONED for hugetlbfs, but
PTE_MARKER also needs support for swap entries. For s390, swap entries
were only supported on PTE level, not on the PMD/PUD levels that are used
for large hugetlbfs mappings.

Therefore, when writing a PTE_MARKER_POISONED entry, the resulting entry
on PMD/PUD level would be an invalid / empty entry. Further access would
then generate a pagefault loop, instead of the expected SIGBUS. It is a
loop inside the kernel, but interruptible and uffd fault handling also
calls schedule() in between, so at least it won't completely block the
system.

Previous commits prepared support for swap entries on PMD/PUD levels.
PTE_MARKER support for hugetlbfs can now be enabled by simply adding an
extra is_pte_marker() check to huge_pte_none_mostly(). Fault handling
code also needs to be adjusted to expect the VM_FAULT_HWPOISON_LARGE
fault flag, which was not possible on s390 before.

Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2024-11-27 12:57:01 +01:00
arch s390/mm: Add PTE_MARKER support for hugetlbfs mappings 2024-11-27 12:57:01 +01:00
block for-6.13/block-20241118 2024-11-18 16:50:08 -08:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto Random number generator updates for Linux 6.13-rc1. 2024-11-19 10:43:44 -08:00
Documentation Locking changes for v6.13 are: 2024-11-19 12:43:11 -08:00
drivers s390/ap: Replace xchg() with WRITE_ONCE() 2024-11-27 12:55:15 +01:00
fs Scheduler changes for v6.13: 2024-11-19 14:16:06 -08:00
include Scheduler changes for v6.13: 2024-11-19 14:16:06 -08:00
init vfs-6.13.misc 2024-11-18 09:35:30 -08:00
io_uring for-6.13/io_uring-20241118 2024-11-18 17:02:57 -08:00
ipc fdget(), more trivial conversions 2024-11-03 01:28:06 -05:00
kernel Scheduler changes for v6.13: 2024-11-19 14:16:06 -08:00
lib Locking changes for v6.13 are: 2024-11-19 12:43:11 -08:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm arm64 updates for 6.13: 2024-11-18 18:10:37 -08:00
net Random number generator updates for Linux 6.13-rc1. 2024-11-19 10:43:44 -08:00
rust Locking changes for v6.13 are: 2024-11-19 12:43:11 -08:00
samples - Log and handle twp new AMD-specific MCA registers: SYND1 and SYND2 and 2024-11-19 12:04:51 -08:00
scripts Objtool changes for v6.13: 2024-11-19 13:27:52 -08:00
security This update includes the following changes: 2024-11-19 10:28:41 -08:00
sound the bulk of struct fd memory safety stuff 2024-11-18 12:24:06 -08:00
tools Performance events changes for v6.13: 2024-11-19 13:34:06 -08:00
usr initramfs: shorten cmd_initfs in usr/Makefile 2024-07-16 01:07:52 +09:00
virt the bulk of struct fd memory safety stuff 2024-11-18 12:24:06 -08:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: Retire Ralf Baechle 2024-11-12 15:48:59 +01:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Kbuild updates for v6.12 2024-09-24 13:02:06 -07:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -08:00
.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 - Add support for Bluefield-2 SOCs to bluefield_edac 2024-11-19 12:00:10 -08:00
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 - Add support for Bluefield-2 SOCs to bluefield_edac 2024-11-19 12:00:10 -08:00
Makefile Linux 6.12 2024-11-17 14:15:08 -08:00
README README: Fix spelling 2024-03-18 03:36:32 -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 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.