linux.git/mm/internal.h, branch v6.8

mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER

2024-01-08T23:27:15+00:00

commit 23baf831a32c ("mm, treewide: redefine MAX_ORDER sanely") has
changed the definition of MAX_ORDER to be inclusive.  This has caused
issues with code that was not yet upstream and depended on the previous
definition.

To draw attention to the altered meaning of the define, rename MAX_ORDER
to MAX_PAGE_ORDER.

Link: https://lkml.kernel.org/r/20231228144704.14033-2-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov 
Cc: Linus Torvalds 
Signed-off-by: Andrew Morton

mm: remove one last reference to page_add_*_rmap()

2023-12-29T19:58:57+00:00

Let's fixup one remaining comment.  Note that the only trace remaining of
the old rmap interface is in an example in Documentation/trace/ftrace.rst,
that we'll just leave alone.

Link: https://lkml.kernel.org/r/20231220224504.646757-41-david@redhat.com
Signed-off-by: David Hildenbrand 
Cc: Hugh Dickins 
Cc: Matthew Wilcox (Oracle) 
Cc: Muchun Song 
Cc: Muchun Song 
Cc: Peter Xu 
Cc: Ryan Roberts 
Cc: Yin Fengwei 
Signed-off-by: Andrew Morton

mm/rmap: rename COMPOUND_MAPPED to ENTIRELY_MAPPED

2023-12-29T19:58:56+00:00

We removed all "bool compound" and RMAP_COMPOUND parameters.  Let's remove
the remaining "compound" terminology by making COMPOUND_MAPPED match the
"folio->_entire_mapcount" terminology, renaming it to ENTIRELY_MAPPED.

ENTIRELY_MAPPED is only used when the whole folio is mapped using a single
page table entry (e.g., a single PMD mapping a PMD-sized THP).  For now,
we don't support mapping any THP bigger than that, so ENTIRELY_MAPPED only
applies to PMD-mapped PMD-sized THP only.

Link: https://lkml.kernel.org/r/20231220224504.646757-40-david@redhat.com
Signed-off-by: David Hildenbrand 
Cc: Hugh Dickins 
Cc: Matthew Wilcox (Oracle) 
Cc: Muchun Song 
Cc: Muchun Song 
Cc: Peter Xu 
Cc: Ryan Roberts 
Cc: Yin Fengwei 
Signed-off-by: Andrew Morton

mm: convert page_try_share_anon_rmap() to folio_try_share_anon_rmap_[pte|pmd]()

2023-12-29T19:58:56+00:00

Let's convert it like we converted all the other rmap functions.  Don't
introduce folio_try_share_anon_rmap_ptes() for now, as we don't have a
user that wants rmap batching in sight.  Pretty easy to add later.

All users are easy to convert -- only ksm.c doesn't use folios yet but
that is left for future work -- so let's just do it in a single shot.

While at it, turn the BUG_ON into a WARN_ON_ONCE.

Note that page_try_share_anon_rmap() so far didn't care about pte/pmd
mappings (no compound parameter).  We're changing that so we can perform
better sanity checks and make the code actually more readable/consistent. 
For example, __folio_rmap_sanity_checks() will make sure that a PMD range
actually falls completely into the folio.

Link: https://lkml.kernel.org/r/20231220224504.646757-39-david@redhat.com
Signed-off-by: David Hildenbrand 
Cc: Hugh Dickins 
Cc: Matthew Wilcox (Oracle) 
Cc: Muchun Song 
Cc: Muchun Song 
Cc: Peter Xu 
Cc: Ryan Roberts 
Cc: Yin Fengwei 
Signed-off-by: Andrew Morton

mm/rmap: remove page_remove_rmap()

2023-12-29T19:58:55+00:00

All callers are gone, let's remove it and some leftover traces.

Link: https://lkml.kernel.org/r/20231220224504.646757-33-david@redhat.com
Signed-off-by: David Hildenbrand 
Cc: Hugh Dickins 
Cc: Matthew Wilcox (Oracle) 
Cc: Muchun Song 
Cc: Muchun Song 
Cc: Peter Xu 
Cc: Ryan Roberts 
Cc: Yin Fengwei 
Signed-off-by: Andrew Morton

mm: use vma_pages() for vma objects

2023-12-12T18:57:08+00:00

vma_pages() is more readable and also better at avoiding error codes, so
use vma_pages() instead of direct operations on vma

Link: https://lkml.kernel.org/r/tencent_151850CF327EB055BBC83298A929BD06CD0A@qq.com
Signed-off-by: Chen Haonan 
Signed-off-by: Andrew Morton

maple_tree: separate ma_state node from status

2023-12-12T18:56:58+00:00

The maple tree node is overloaded to keep status as well as the active
node.  This, unfortunately, results in a re-walk on underflow or overflow.
Since the maple state has room, the status can be placed in its own enum
in the structure.  Once an underflow/overflow is detected, certain modes
can restore the status to active and others may need to re-walk just that
one node to see the entry.

The status being an enum has the benefit of detecting unhandled status in
switch statements.

[Liam.Howlett@oracle.com: fix comments about MAS_*]
  Link: https://lkml.kernel.org/r/20231106154124.614247-1-Liam.Howlett@oracle.com
[Liam.Howlett@oracle.com: update forking to separate maple state and node]
  Link: https://lkml.kernel.org/r/20231106154551.615042-1-Liam.Howlett@oracle.com
[Liam.Howlett@oracle.com: fix mas_prev() state separation code]
  Link: https://lkml.kernel.org/r/20231207193319.4025462-1-Liam.Howlett@oracle.com
Link: https://lkml.kernel.org/r/20231101171629.3612299-9-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett 
Cc: Peng Zhang 
Signed-off-by: Andrew Morton

maple_tree: move debug check to __mas_set_range()

2023-12-12T18:56:57+00:00

__mas_set_range() was created to shortcut resetting the maple state and a
debug check was added to the caller (the vma iterator) to ensure the
internal maple state remains safe to use.  Move the debug check from the
vma iterator into the maple tree itself so other users do not incorrectly
use the advanced maple state modification.

Fallout from this change include a large amount of debug setup needed to
be moved to earlier in the header, and the maple_tree.h radix-tree test
code needed to move the inclusion of the header to after the atomic
define.  None of those changes have functional changes.

Link: https://lkml.kernel.org/r/20231101171629.3612299-4-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett 
Cc: Peng Zhang 
Signed-off-by: Andrew Morton

mm: remove invalidate_inode_page()

2023-12-11T00:51:39+00:00

All callers are now converted to call mapping_evict_folio().

Link: https://lkml.kernel.org/r/20231108182809.602073-7-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) 
Cc: Naoya Horiguchi 
Signed-off-by: Andrew Morton

mm: make mapping_evict_folio() the preferred way to evict clean folios

2023-12-11T00:51:37+00:00

Patch series "Fix fault handler's handling of poisoned tail pages".

Since introducing the ability to have large folios in the page cache, it's
been possible to have a hwpoisoned tail page returned from the fault
handler.  We handle this situation poorly; failing to remove the affected
page from use.

This isn't a minimal patch to fix it, it's a full conversion of all the
code surrounding it.


This patch (of 6):

invalidate_inode_page() does very little beyond calling
mapping_evict_folio().  Move the check for mapping being NULL into
mapping_evict_folio() and make it available to the rest of the MM for use
in the next few patches.

Link: https://lkml.kernel.org/r/20231108182809.602073-1-willy@infradead.org
Link: https://lkml.kernel.org/r/20231108182809.602073-2-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) 
Cc: Naoya Horiguchi 
Signed-off-by: Andrew Morton