* + selftests-mm-remove-read_only_thp_for_fs-code-from-guard-regions.patch added to mm-new branch
@ 2026-04-24 10:31 Andrew Morton
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Morton @ 2026-04-24 10:31 UTC (permalink / raw)
To: mm-commits, ziy, akpm
The patch titled
Subject: selftests/mm: remove READ_ONLY_THP_FOR_FS code from guard-regions
has been added to the -mm mm-new branch. Its filename is
selftests-mm-remove-read_only_thp_for_fs-code-from-guard-regions.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-remove-read_only_thp_for_fs-code-from-guard-regions.patch
This patch will later appear in the mm-new branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews. Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.
The mm-new branch of mm.git is not included in linux-next
If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days
------------------------------------------------------
From: Zi Yan <ziy@nvidia.com>
Subject: selftests/mm: remove READ_ONLY_THP_FOR_FS code from guard-regions
Date: Thu, 23 Apr 2026 22:49:15 -0400
Any file system with large folio support and the supported orders include
PMD_ORDER can be used. There is no need to open a file with read-only.
Link: https://lore.kernel.org/20260424024915.28758-13-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Chris Mason <clm@fb.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Cc: David Sterba <dsterba@suse.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nico Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
tools/testing/selftests/mm/guard-regions.c | 18 ++++--------------
1 file changed, 4 insertions(+), 14 deletions(-)
--- a/tools/testing/selftests/mm/guard-regions.c~selftests-mm-remove-read_only_thp_for_fs-code-from-guard-regions
+++ a/tools/testing/selftests/mm/guard-regions.c
@@ -2203,17 +2203,6 @@ TEST_F(guard_regions, collapse)
if (variant->backing != ANON_BACKED)
ASSERT_EQ(ftruncate(self->fd, size), 0);
- /*
- * We must close and re-open local-file backed as read-only for
- * CONFIG_READ_ONLY_THP_FOR_FS to work.
- */
- if (variant->backing == LOCAL_FILE_BACKED) {
- ASSERT_EQ(close(self->fd), 0);
-
- self->fd = open(self->path, O_RDONLY);
- ASSERT_GE(self->fd, 0);
- }
-
ptr = mmap_(self, variant, NULL, size, PROT_READ, 0, 0);
ASSERT_NE(ptr, MAP_FAILED);
@@ -2237,9 +2226,10 @@ TEST_F(guard_regions, collapse)
/*
* Now collapse the entire region. This should fail in all cases.
*
- * The madvise() call will also fail if CONFIG_READ_ONLY_THP_FOR_FS is
- * not set for the local file case, but we can't differentiate whether
- * this occurred or if the collapse was rightly rejected.
+ * The madvise() call will also fail if the file system does not support
+ * large folio or the supported orders do not include PMD_ORDER for the
+ * local file case, but we can't differentiate whether this occurred or
+ * if the collapse was rightly rejected.
*/
EXPECT_NE(madvise(ptr, size, MADV_COLLAPSE), 0);
_
Patches currently in -mm which might be from ziy@nvidia.com are
mm-khugepaged-remove-read_only_thp_for_fs-check.patch
mm-khugepaged-add-folio-dirty-check-after-try_to_unmap.patch
mm-huge_memory-remove-read_only_thp_for_fs-from-file_thp_enabled.patch
mm-khugepaged-remove-read_only_thp_for_fs-check-in-hugepage_enabled.patch
mm-remove-read_only_thp_for_fs-kconfig-option.patch
mm-fs-remove-filemap_nr_thps-functions-and-their-users.patch
fs-remove-nr_thps-from-struct-address_space.patch
mm-huge_memory-remove-folio-split-check-for-read_only_thp_for_fs.patch
mm-truncate-use-folio_split-in-truncate_inode_partial_folio.patch
fs-btrfs-remove-a-comment-referring-to-read_only_thp_for_fs.patch
selftests-mm-remove-read_only_thp_for_fs-in-khugepaged.patch
selftests-mm-remove-read_only_thp_for_fs-code-from-guard-regions.patch
^ permalink raw reply [flat|nested] 2+ messages in thread
* + selftests-mm-remove-read_only_thp_for_fs-code-from-guard-regions.patch added to mm-new branch
@ 2026-04-29 16:13 Andrew Morton
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Morton @ 2026-04-29 16:13 UTC (permalink / raw)
To: mm-commits, ziy, akpm
The patch titled
Subject: selftests/mm: remove READ_ONLY_THP_FOR_FS code from guard-regions
has been added to the -mm mm-new branch. Its filename is
selftests-mm-remove-read_only_thp_for_fs-code-from-guard-regions.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-remove-read_only_thp_for_fs-code-from-guard-regions.patch
This patch will later appear in the mm-new branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews. Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.
The mm-new branch of mm.git is not included in linux-next
If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days
------------------------------------------------------
From: Zi Yan <ziy@nvidia.com>
Subject: selftests/mm: remove READ_ONLY_THP_FOR_FS code from guard-regions
Date: Wed, 29 Apr 2026 11:35:35 -0400
Any file system with large folio support and the supported orders include
PMD_ORDER can be used. There is no need to open a file with read-only.
Link: https://lore.kernel.org/20260429153538.727855-8-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Chris Mason <clm@fb.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: David Sterba <dsterba@suse.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nico Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
tools/testing/selftests/mm/guard-regions.c | 18 ++++--------------
1 file changed, 4 insertions(+), 14 deletions(-)
--- a/tools/testing/selftests/mm/guard-regions.c~selftests-mm-remove-read_only_thp_for_fs-code-from-guard-regions
+++ a/tools/testing/selftests/mm/guard-regions.c
@@ -2203,17 +2203,6 @@ TEST_F(guard_regions, collapse)
if (variant->backing != ANON_BACKED)
ASSERT_EQ(ftruncate(self->fd, size), 0);
- /*
- * We must close and re-open local-file backed as read-only for
- * CONFIG_READ_ONLY_THP_FOR_FS to work.
- */
- if (variant->backing == LOCAL_FILE_BACKED) {
- ASSERT_EQ(close(self->fd), 0);
-
- self->fd = open(self->path, O_RDONLY);
- ASSERT_GE(self->fd, 0);
- }
-
ptr = mmap_(self, variant, NULL, size, PROT_READ, 0, 0);
ASSERT_NE(ptr, MAP_FAILED);
@@ -2237,9 +2226,10 @@ TEST_F(guard_regions, collapse)
/*
* Now collapse the entire region. This should fail in all cases.
*
- * The madvise() call will also fail if CONFIG_READ_ONLY_THP_FOR_FS is
- * not set for the local file case, but we can't differentiate whether
- * this occurred or if the collapse was rightly rejected.
+ * The madvise() call will also fail if the file system does not support
+ * large folio or the supported orders do not include PMD_ORDER for the
+ * local file case, but we can't differentiate whether this occurred or
+ * if the collapse was rightly rejected.
*/
EXPECT_NE(madvise(ptr, size, MADV_COLLAPSE), 0);
_
Patches currently in -mm which might be from ziy@nvidia.com are
mm-khugepaged-remove-read_only_thp_for_fs-check.patch
mm-khugepaged-add-folio-dirty-check-after-try_to_unmap.patch
mm-huge_memory-remove-read_only_thp_for_fs-from-file_thp_enabled.patch
mm-khugepaged-remove-read_only_thp_for_fs-check-in-hugepage_enabled.patch
mm-remove-read_only_thp_for_fs-kconfig-option.patch
mm-fs-remove-filemap_nr_thps-functions-and-their-users.patch
fs-remove-nr_thps-from-struct-address_space.patch
mm-huge_memory-remove-folio-split-check-for-read_only_thp_for_fs.patch
mm-truncate-use-folio_split-in-truncate_inode_partial_folio.patch
fs-btrfs-remove-a-comment-referring-to-read_only_thp_for_fs.patch
selftests-mm-remove-read_only_thp_for_fs-in-khugepaged.patch
selftests-mm-remove-read_only_thp_for_fs-code-from-guard-regions.patch
mm-khugepaged-enable-clean-pagecache-folio-collapse-for-writable-files.patch
selftests-mm-add-writable-file-collapse-tests-for-khugepaged.patch
^ permalink raw reply [flat|nested] 2+ messages in thread
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