linux-kernel - [PATCH v1 01/10] mm: Expose clear_huge

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Date:   Mon, 26 Jun 2023 18:14:21 +0100
From:   Ryan Roberts <ryan.roberts@....com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Yin Fengwei <fengwei.yin@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Yu Zhao <yuzhao@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     Ryan Roberts <ryan.roberts@....com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-alpha@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, linux-s390@...r.kernel.org
Subject: [PATCH v1 01/10] mm: Expose clear_huge_page() unconditionally

In preparation for extending vma_alloc_zeroed_movable_folio() to
allocate a arbitrary order folio, expose clear_huge_page()
unconditionally, so that it can be used to zero the allocated folio in
the generic implementation of vma_alloc_zeroed_movable_folio().

Signed-off-by: Ryan Roberts <ryan.roberts@....com>
---
 include/linux/mm.h | 3 ++-
 mm/memory.c        | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7f1741bd870a..7e3bf45e6491 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3684,10 +3684,11 @@ enum mf_action_page_type {
  */
 extern const struct attribute_group memory_failure_attr_group;
 
-#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
 extern void clear_huge_page(struct page *page,
 			    unsigned long addr_hint,
 			    unsigned int pages_per_huge_page);
+
+#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
 int copy_user_large_folio(struct folio *dst, struct folio *src,
 			  unsigned long addr_hint,
 			  struct vm_area_struct *vma);
diff --git a/mm/memory.c b/mm/memory.c
index fb30f7523550..3d4ea668c4d1 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -5741,7 +5741,6 @@ void __might_fault(const char *file, int line)
 EXPORT_SYMBOL(__might_fault);
 #endif
 
-#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
 /*
  * Process all subpages of the specified huge page with the specified
  * operation.  The target subpage will be processed last to keep its
@@ -5839,6 +5838,7 @@ void clear_huge_page(struct page *page,
 	process_huge_page(addr_hint, pages_per_huge_page, clear_subpage, page);
 }
 
+#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
 static int copy_user_gigantic_page(struct folio *dst, struct folio *src,
 				     unsigned long addr,
 				     struct vm_area_struct *vma,
-- 
2.25.1