The patch titled
Subject: mm: move folio_set_compound_order() to mm/internal.h
has been added to the -mm mm-unstable branch. Its filename is
mm-move-folio_set_compound_order-to-mm-internalh.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-move-folio_set_compound_order-to-mm-internalh.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: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Subject: mm: move folio_set_compound_order() to mm/internal.h
Date: Wed, 14 Dec 2022 22:17:57 -0800
folio_set_compound_order() is moved to an mm-internal location so external
folio users cannot misuse this function. Change the name of the function
to folio_set_order() and use WARN_ON_ONCE() rather than BUG_ON. Also,
handle the case if a non-large folio is passed and add clarifying comments
to the function.
Link: https://lore.kernel.org/lkml/20221207223731.32784-1-sidhartha.kumar@xxxxxxxxxx/T/
Link: https://lkml.kernel.org/r/20221215061757.223440-1-sidhartha.kumar@xxxxxxxxxx
Fixes: 9fd330582b2f ("mm: add folio dtor and order setter functions")
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Suggested-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Suggested-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Suggested-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Suggested-by: John Hubbard <jhubbard@xxxxxxxxxx>
Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 16 ----------------
mm/hugetlb.c | 6 +++---
mm/internal.h | 19 +++++++++++++++++++
3 files changed, 22 insertions(+), 19 deletions(-)
--- a/include/linux/mm.h~mm-move-folio_set_compound_order-to-mm-internalh
+++ a/include/linux/mm.h
@@ -1019,22 +1019,6 @@ static inline void set_compound_order(st
#endif
}
-/*
- * folio_set_compound_order is generally passed a non-zero order to
- * initialize a large folio. However, hugetlb code abuses this by
- * passing in zero when 'dissolving' a large folio.
- */
-static inline void folio_set_compound_order(struct folio *folio,
- unsigned int order)
-{
- VM_BUG_ON_FOLIO(!folio_test_large(folio), folio);
-
- folio->_folio_order = order;
-#ifdef CONFIG_64BIT
- folio->_folio_nr_pages = order ? 1U << order : 0;
-#endif
-}
-
/* Returns the number of pages in this potentially compound page. */
static inline unsigned long compound_nr(struct page *page)
{
--- a/mm/hugetlb.c~mm-move-folio_set_compound_order-to-mm-internalh
+++ a/mm/hugetlb.c
@@ -1344,7 +1344,7 @@ static void __destroy_compound_gigantic_
set_page_refcounted(p);
}
- folio_set_compound_order(folio, 0);
+ folio_set_order(folio, 0);
__folio_clear_head(folio);
}
@@ -1808,7 +1808,7 @@ static bool __prep_compound_gigantic_fol
__folio_clear_reserved(folio);
__folio_set_head(folio);
/* we rely on prep_new_hugetlb_folio to set the destructor */
- folio_set_compound_order(folio, order);
+ folio_set_order(folio, order);
for (i = 0; i < nr_pages; i++) {
p = folio_page(folio, i);
@@ -1872,7 +1872,7 @@ out_error:
p = folio_page(folio, j);
__ClearPageReserved(p);
}
- folio_set_compound_order(folio, 0);
+ folio_set_order(folio, 0);
__folio_clear_head(folio);
return false;
}
--- a/mm/internal.h~mm-move-folio_set_compound_order-to-mm-internalh
+++ a/mm/internal.h
@@ -378,6 +378,25 @@ extern void *memmap_alloc(phys_addr_t si
int split_free_page(struct page *free_page,
unsigned int order, unsigned long split_pfn_offset);
+/*
+ * This will have no effect, other than possibly generating a warning, if the
+ * caller passes in a non-large folio.
+ */
+static inline void folio_set_order(struct folio *folio, unsigned int order)
+{
+ if (WARN_ON_ONCE(!folio_test_large(folio)))
+ return;
+
+ folio->_folio_order = order;
+#ifdef CONFIG_64BIT
+ /*
+ * When hugetlb dissolves a folio, we need to clear the tail
+ * page, rather than setting nr_pages to 1.
+ */
+ folio->_folio_nr_pages = order ? 1U << order : 0;
+#endif
+}
+
#if defined CONFIG_COMPACTION || defined CONFIG_CMA
/*
_
Patches currently in -mm which might be from sidhartha.kumar@xxxxxxxxxx are
mm-move-folio_set_compound_order-to-mm-internalh.patch
