+ mm-remove-pageksm.patch added to mm-unstable branch

+ mm-remove-pageksm.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm: remove PageKsm()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-remove-pageksm.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-remove-pageksm.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@infradead.org>
Subject: mm: remove PageKsm()
Date: Wed, 2 Oct 2024 16:25:31 +0100

All callers have been converted to use folio_test_ksm() or
PageAnonNotKsm(), so we can remove this wrapper.

Link: https://lkml.kernel.org/r/20241002152533.1350629-6-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Alex Shi <alexs@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/page-flags.h |    7 +------
 mm/internal.h              |    2 +-
 mm/ksm.c                   |    4 ++--
 3 files changed, 4 insertions(+), 9 deletions(-)

--- a/include/linux/page-flags.h~mm-remove-pageksm
+++ a/include/linux/page-flags.h
@@ -725,13 +725,8 @@ static __always_inline bool folio_test_k
 	return ((unsigned long)folio->mapping & PAGE_MAPPING_FLAGS) ==
 				PAGE_MAPPING_KSM;
 }
-
-static __always_inline bool PageKsm(const struct page *page)
-{
-	return folio_test_ksm(page_folio(page));
-}
 #else
-TESTPAGEFLAG_FALSE(Ksm, ksm)
+FOLIO_TEST_FLAG_FALSE(ksm)
 #endif
 
 u64 stable_page_flags(const struct page *page);
--- a/mm/internal.h~mm-remove-pageksm
+++ a/mm/internal.h
@@ -1311,7 +1311,7 @@ static inline bool gup_must_unshare(stru
 		smp_rmb();
 
 	/*
-	 * Note that PageKsm() pages cannot be exclusive, and consequently,
+	 * Note that KSM pages cannot be exclusive, and consequently,
 	 * cannot get pinned.
 	 */
 	return !PageAnonExclusive(page);
--- a/mm/ksm.c~mm-remove-pageksm
+++ a/mm/ksm.c
@@ -656,7 +656,7 @@ static int break_ksm(struct vm_area_stru
 	 *
 	 * VM_FAULT_SIGBUS could occur if we race with truncation of the
 	 * backing file, which also invalidates anonymous pages: that's
-	 * okay, that truncation will have unmapped the PageKsm for us.
+	 * okay, that truncation will have unmapped the KSM page for us.
 	 *
 	 * VM_FAULT_OOM: at the time of writing (late July 2009), setting
 	 * aside mem_cgroup limits, VM_FAULT_OOM would only be set if the
@@ -1434,7 +1434,7 @@ out:
  * try_to_merge_one_page - take two pages and merge them into one
  * @vma: the vma that holds the pte pointing to page
  * @page: the PageAnon page that we want to replace with kpage
- * @kpage: the PageKsm page that we want to map instead of page,
+ * @kpage: the KSM page that we want to map instead of page,
  *         or NULL the first time when we want to use page as kpage.
  *
  * This function returns 0 if the pages were merged, -EFAULT otherwise.
_

Patches currently in -mm which might be from willy@infradead.org 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