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A mirror of the official Linux kernel repository just in case
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Oscar Salvador 07a57a338a mm,swapops: update check in is_pfn_swap_entry for hwpoison entries 
Tony reported that the Machine check recovery was broken in v6.9-rc1, as
he was hitting a VM_BUG_ON when injecting uncorrectable memory errors to
DRAM.

After some more digging and debugging on his side, he realized that this
went back to v6.1, with the introduction of 'commit 0d206b5d2e
("mm/swap: add swp_offset_pfn() to fetch PFN from swap entry")'.  That
commit, among other things, introduced swp_offset_pfn(), replacing
hwpoison_entry_to_pfn() in its favour.

The patch also introduced a VM_BUG_ON() check for is_pfn_swap_entry(), but
is_pfn_swap_entry() never got updated to cover hwpoison entries, which
means that we would hit the VM_BUG_ON whenever we would call
swp_offset_pfn() for such entries on environments with CONFIG_DEBUG_VM
set.  Fix this by updating the check to cover hwpoison entries as well,
and update the comment while we are it.

Link: https://lkml.kernel.org/r/20240407130537.16977-1-osalvador@suse.de
Fixes: 0d206b5d2e ("mm/swap: add swp_offset_pfn() to fetch PFN from swap entry")
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Reported-by: Tony Luck <tony.luck@intel.com>
Closes: https://lore.kernel.org/all/Zg8kLSl2yAlA3o5D@agluck-desk3/
Tested-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: <stable@vger.kernel.org>	[6.1.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-04-16 15:39:50 -07:00
arch Misc x86 fixes: 2024-04-14 10:48:51 -07:00
block block-6.9-20240412 2024-04-12 10:22:33 -07:00
certs This update includes the following changes: 2023-11-02 16:15:30 -10:00
crypto This push fixes a regression that broke iwd as well as a divide by 2024-03-25 10:48:23 -07:00
Documentation mm,page_owner: fix refcount imbalance 2024-04-16 15:39:49 -07:00
drivers Fix a bug in the GIC irqchip driver. 2024-04-14 10:12:34 -07:00
fs Get rid of lockdep false positives around sysfs/overlayfs 2024-04-14 11:41:51 -07:00
include mm,swapops: update check in is_pfn_swap_entry for hwpoison entries 2024-04-16 15:39:50 -07:00
init fs/proc: Skip bootloader comment if no embedded kernel parameters 2024-04-09 23:36:18 +09:00
io_uring io_uring/net: restore msg_control on sendzc retry 2024-04-08 21:48:41 -06:00
ipc sysctl changes for v6.9-rc1 2024-03-18 14:59:13 -07:00
kernel Misc x86 fixes: 2024-04-14 10:48:51 -07:00
lib Including fixes from bluetooth. 2024-04-11 11:46:31 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/memory-failure: fix deadlock when hugetlb_optimize_vmemmap is enabled 2024-04-16 15:39:50 -07:00
net Including fixes from bluetooth. 2024-04-11 11:46:31 -07:00
rust Kbuild updates for v6.9 2024-03-21 14:41:00 -07:00
samples Tracing updates for 6.9: 2024-03-18 15:11:44 -07:00
scripts hardening fixes for v6.9-rc4 2024-04-10 13:31:34 -07:00
security security: Place security_path_post_mknod() where the original IMA call was 2024-04-03 10:21:32 -07:00
sound ASoC: Fixes for v6.9 2024-04-05 08:48:12 +02:00
tools Misc timer fixes: 2024-04-14 10:32:22 -07:00
usr Kbuild updates for v6.8 2024-01-18 17:57:07 -08:00
virt KVM Xen and pfncache changes for 6.9: 2024-03-11 10:42:55 -04:00
.clang-format clang-format: Update with v6.7-rc4's for_each macro list 2023-12-08 23:54:38 +01:00
.cocciconfig
.editorconfig Add .editorconfig file for basic formatting 2023-12-28 16:22:47 +09:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: create a list of all built DTB files 2024-02-19 18:20:39 +09:00
.mailmap MAINTAINERS: change vmware.com addresses to broadcom.com 2024-04-05 11:21:31 -07:00
.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: Drop Gustavo Pimentel as PCI DWC Maintainer 2024-03-27 13:41:02 -05:00
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 SoC fixes for 6.9 2024-04-12 13:02:27 -07:00
Makefile Linux 6.9-rc4 2024-04-14 13:38:39 -07:00
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.