thp: share get_huge_page_tail()
This avoids duplicating the function in every arch gup_fast.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <jweiner@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 1c59d94..da5eb38 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -385,17 +385,6 @@
return NULL;
}
-static inline void get_huge_page_tail(struct page *page)
-{
- /*
- * __split_huge_page_refcount() cannot run
- * from under us.
- */
- VM_BUG_ON(page_mapcount(page) < 0);
- VM_BUG_ON(atomic_read(&page->_count) != 0);
- atomic_inc(&page->_mapcount);
-}
-
static noinline int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
unsigned long end, int write, struct page **pages, int *nr)
{
diff --git a/arch/s390/mm/gup.c b/arch/s390/mm/gup.c
index da33a02..65cb06e 100644
--- a/arch/s390/mm/gup.c
+++ b/arch/s390/mm/gup.c
@@ -48,17 +48,6 @@
return 1;
}
-static inline void get_huge_page_tail(struct page *page)
-{
- /*
- * __split_huge_page_refcount() cannot run
- * from under us.
- */
- VM_BUG_ON(page_mapcount(page) < 0);
- VM_BUG_ON(atomic_read(&page->_count) != 0);
- atomic_inc(&page->_mapcount);
-}
-
static inline int gup_huge_pmd(pmd_t *pmdp, pmd_t pmd, unsigned long addr,
unsigned long end, int write, struct page **pages, int *nr)
{
diff --git a/arch/sparc/mm/gup.c b/arch/sparc/mm/gup.c
index afcebac..42c55df 100644
--- a/arch/sparc/mm/gup.c
+++ b/arch/sparc/mm/gup.c
@@ -12,17 +12,6 @@
#include <linux/rwsem.h>
#include <asm/pgtable.h>
-static inline void get_huge_page_tail(struct page *page)
-{
- /*
- * __split_huge_page_refcount() cannot run
- * from under us.
- */
- VM_BUG_ON(page_mapcount(page) < 0);
- VM_BUG_ON(atomic_read(&page->_count) != 0);
- atomic_inc(&page->_mapcount);
-}
-
/*
* The performance critical leaf functions are made noinline otherwise gcc
* inlines everything into a single function which results in too much
diff --git a/arch/x86/mm/gup.c b/arch/x86/mm/gup.c
index 3b5032a..ea30585 100644
--- a/arch/x86/mm/gup.c
+++ b/arch/x86/mm/gup.c
@@ -108,17 +108,6 @@
SetPageReferenced(page);
}
-static inline void get_huge_page_tail(struct page *page)
-{
- /*
- * __split_huge_page_refcount() cannot run
- * from under us.
- */
- VM_BUG_ON(page_mapcount(page) < 0);
- VM_BUG_ON(atomic_read(&page->_count) != 0);
- atomic_inc(&page->_mapcount);
-}
-
static noinline int gup_huge_pmd(pmd_t pmd, unsigned long addr,
unsigned long end, int write, struct page **pages, int *nr)
{
diff --git a/include/linux/mm.h b/include/linux/mm.h
index f81b7b4..3dc3a8c 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -376,6 +376,17 @@
return atomic_read(&compound_head(page)->_count);
}
+static inline void get_huge_page_tail(struct page *page)
+{
+ /*
+ * __split_huge_page_refcount() cannot run
+ * from under us.
+ */
+ VM_BUG_ON(page_mapcount(page) < 0);
+ VM_BUG_ON(atomic_read(&page->_count) != 0);
+ atomic_inc(&page->_mapcount);
+}
+
extern bool __get_page_tail(struct page *page);
static inline void get_page(struct page *page)