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David Hildenbrand 3aeea4fc83 mm/memory: use folio_mapcount() in zap_present_folio_ptes() 
We want to limit the use of page_mapcount() to the places where it is
absolutely necessary.  In zap_present_folio_ptes(), let's simply check the
folio mapcount().  If there is some issue, it will underflow at some point
either way when unmapping.

As indicated already in commit 10ebac4f95 ("mm/memory: optimize
unmap/zap with PTE-mapped THP"), we already documented "If we ever have a
cheap folio_mapcount(), we might just want to check for underflows
there.".

There is no change for small folios.  For large folios, we'll now catch
more underflows when batch-unmapping, because instead of only testing the
mapcount of the first subpage, we'll test if the folio mapcount
underflows.

Link: https://lkml.kernel.org/r/20240409192301.907377-8-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: Hugh Dickins <hughd@google.com>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Richard Chang <richardycc@google.com>
Cc: Rich Felker <dalias@libc.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Yin Fengwei <fengwei.yin@intel.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-05-05 17:53:29 -07:00
arch mm: pass VMA instead of MM to follow_pte() 2024-05-05 17:53:27 -07:00
block block-6.9-20240412 2024-04-12 10:22:33 -07:00
certs
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: track mapcount of large folios in single value 2024-05-05 17:53:28 -07:00
drivers mm: pass VMA instead of MM to follow_pte() 2024-05-05 17:53:27 -07:00
fs proc: convert smaps_pmd_entry to use a folio 2024-04-25 20:56:36 -07:00
include mm: make folio_mapcount() return 0 for small typed folios 2024-05-05 17:53:29 -07:00
init mm: introduce slabobj_ext to support slab object extensions 2024-04-25 20:55:51 -07:00
io_uring mm: switch mm->get_unmapped_area() to a flag 2024-04-25 20:56:25 -07:00
ipc sysctl changes for v6.9-rc1 2024-03-18 14:59:13 -07:00
kernel mm/treewide: rename CONFIG_HAVE_FAST_GUP to CONFIG_HAVE_GUP_FAST 2024-04-25 20:56:41 -07:00
lib mm/filemap: optimize filemap folio adding 2024-04-25 20:56:09 -07:00
LICENSES
mm mm/memory: use folio_mapcount() in zap_present_folio_ptes() 2024-05-05 17:53:29 -07:00
net mm: change inlined allocation helpers to account at the call site 2024-04-25 20:55:59 -07:00
rust rust: add a rust helper for krealloc() 2024-04-25 20:55:55 -07:00
samples Tracing updates for 6.9: 2024-03-18 15:11:44 -07:00
scripts lib: add allocation tagging support for memory allocation profiling 2024-04-25 20:55:52 -07:00
security mm: init_mlocked_on_free_v3 2024-04-25 20:56:29 -07:00
sound fix missing vmalloc.h includes 2024-04-25 20:55:49 -07:00
tools selftests/mm: fix additional build errors for selftests 2024-04-25 20:56:42 -07:00
usr
virt mm: pass VMA instead of MM to follow_pte() 2024-05-05 17:53:27 -07:00
.clang-format
.cocciconfig
.editorconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap MAINTAINERS: update Naoya Horiguchi's email address 2024-04-16 15:39:51 -07:00
.rustfmt.toml
COPYING
CREDITS MAINTAINERS: Drop Gustavo Pimentel as PCI DWC Maintainer 2024-03-27 13:41:02 -05:00
Kbuild
Kconfig
MAINTAINERS MAINTAINERS: add entries for code tagging and memory allocation profiling 2024-04-25 20:55:58 -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.