linux-kernel - [PATCH v2 13/26] mm: export wp_page

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Date:   Tue, 12 Feb 2019 10:56:19 +0800
From:   Peter Xu <peterx@...hat.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     David Hildenbrand <david@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Maya Gokhale <gokhale2@...l.gov>,
        Jerome Glisse <jglisse@...hat.com>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Johannes Weiner <hannes@...xchg.org>, peterx@...hat.com,
        Martin Cracauer <cracauer@...s.org>, Shaohua Li <shli@...com>,
        Marty McFadden <mcfadden8@...l.gov>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Denis Plotnikov <dplotnikov@...tuozzo.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Mel Gorman <mgorman@...e.de>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>
Subject: [PATCH v2 13/26] mm: export wp_page_copy()

Export this function for usages outside page fault handlers.

Signed-off-by: Peter Xu <peterx@...hat.com>
---
 include/linux/mm.h | 2 ++
 mm/memory.c        | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index f38fbe9c8bc9..2fd14a62324b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -405,6 +405,8 @@ struct vm_fault {
 					 */
 };
 
+vm_fault_t wp_page_copy(struct vm_fault *vmf);
+
 /* page entry size for vm->huge_fault() */
 enum page_entry_size {
 	PE_SIZE_PTE = 0,
diff --git a/mm/memory.c b/mm/memory.c
index f8d83ae16eff..32d32b6e6339 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2239,7 +2239,7 @@ static inline void wp_page_reuse(struct vm_fault *vmf)
  *   held to the old page, as well as updating the rmap.
  * - In any case, unlock the PTL and drop the reference we took to the old page.
  */
-static vm_fault_t wp_page_copy(struct vm_fault *vmf)
+vm_fault_t wp_page_copy(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
 	struct mm_struct *mm = vma->vm_mm;
-- 
2.17.1