The patch titled
Subject: mm: add PageAnonNotKsm()
has been added to the -mm mm-unstable branch. Its filename is
mm-add-pageanonnotksm.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-add-pageanonnotksm.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm: add PageAnonNotKsm()
Date: Wed, 2 Oct 2024 16:25:30 +0100
Check that this anonymous page is really anonymous, not anonymous-or-KSM.
This optimises the debug check, but its real purpose is to remove the last
two users of PageKsm().
Link: https://lkml.kernel.org/r/20241002152533.1350629-5-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Alex Shi <alexs@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/page-flags.h | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
--- a/include/linux/page-flags.h~mm-add-pageanonnotksm
+++ a/include/linux/page-flags.h
@@ -689,6 +689,13 @@ static __always_inline bool folio_test_a
return ((unsigned long)folio->mapping & PAGE_MAPPING_ANON) != 0;
}
+static __always_inline bool PageAnonNotKsm(const struct page *page)
+{
+ unsigned long flags = (unsigned long)page_folio(page)->mapping;
+
+ return (flags & PAGE_MAPPING_FLAGS) == PAGE_MAPPING_ANON;
+}
+
static __always_inline bool PageAnon(const struct page *page)
{
return folio_test_anon(page_folio(page));
@@ -1129,14 +1136,14 @@ static __always_inline int PageAnonExclu
static __always_inline void SetPageAnonExclusive(struct page *page)
{
- VM_BUG_ON_PGFLAGS(!PageAnon(page) || PageKsm(page), page);
+ VM_BUG_ON_PGFLAGS(PageAnonNotKsm(page), page);
VM_BUG_ON_PGFLAGS(PageHuge(page) && !PageHead(page), page);
set_bit(PG_anon_exclusive, &PF_ANY(page, 1)->flags);
}
static __always_inline void ClearPageAnonExclusive(struct page *page)
{
- VM_BUG_ON_PGFLAGS(!PageAnon(page) || PageKsm(page), page);
+ VM_BUG_ON_PGFLAGS(PageAnonNotKsm(page), page);
VM_BUG_ON_PGFLAGS(PageHuge(page) && !PageHead(page), page);
clear_bit(PG_anon_exclusive, &PF_ANY(page, 1)->flags);
}
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
ksm-use-a-folio-in-try_to_merge_one_page.patch
ksm-convert-cmp_and_merge_page-to-use-a-folio.patch
ksm-convert-should_skip_rmap_item-to-take-a-folio.patch
mm-add-pageanonnotksm.patch
mm-remove-pageksm.patch
