summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--arch/mips/mm/gup.c2
-rw-r--r--arch/powerpc/mm/mmu_context_hash64.c3
-rw-r--r--arch/powerpc/mm/pgtable_64.c2
-rw-r--r--arch/powerpc/platforms/512x/mpc512x_shared.c2
-rw-r--r--arch/x86/mm/gup.c2
-rw-r--r--drivers/block/aoe/aoecmd.c4
-rw-r--r--drivers/net/ethernet/freescale/gianfar.c2
-rw-r--r--drivers/net/ethernet/intel/fm10k/fm10k_main.c2
-rw-r--r--drivers/net/ethernet/intel/igb/igb_main.c2
-rw-r--r--drivers/net/ethernet/intel/ixgbe/ixgbe_main.c2
-rw-r--r--drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c2
-rw-r--r--drivers/net/ethernet/mellanox/mlx4/en_rx.c9
-rw-r--r--drivers/net/ethernet/sun/niu.c2
-rw-r--r--fs/nilfs2/page.c2
-rw-r--r--include/linux/mm.h25
-rw-r--r--include/linux/page_ref.h85
-rw-r--r--include/linux/pagemap.h19
-rw-r--r--mm/debug.c2
-rw-r--r--mm/huge_memory.c6
-rw-r--r--mm/internal.h7
-rw-r--r--mm/memory_hotplug.c4
-rw-r--r--mm/migrate.c10
-rw-r--r--mm/page_alloc.c12
-rw-r--r--mm/vmscan.c6
-rw-r--r--net/core/sock.c2
25 files changed, 134 insertions, 82 deletions
diff --git a/arch/mips/mm/gup.c b/arch/mips/mm/gup.c
index 1afd87c..6cdffc7 100644
--- a/arch/mips/mm/gup.c
+++ b/arch/mips/mm/gup.c
@@ -64,7 +64,7 @@ static inline void get_head_page_multiple(struct page *page, int nr)
{
VM_BUG_ON(page != compound_head(page));
VM_BUG_ON(page_count(page) == 0);
- atomic_add(nr, &page->_count);
+ page_ref_add(page, nr);
SetPageReferenced(page);
}
diff --git a/arch/powerpc/mm/mmu_context_hash64.c b/arch/powerpc/mm/mmu_context_hash64.c
index 4e4efbc..9ca6fe1 100644
--- a/arch/powerpc/mm/mmu_context_hash64.c
+++ b/arch/powerpc/mm/mmu_context_hash64.c
@@ -118,8 +118,7 @@ static void destroy_pagetable_page(struct mm_struct *mm)
/* drop all the pending references */
count = ((unsigned long)pte_frag & ~PAGE_MASK) >> PTE_FRAG_SIZE_SHIFT;
/* We allow PTE_FRAG_NR fragments from a PTE page */
- count = atomic_sub_return(PTE_FRAG_NR - count, &page->_count);
- if (!count) {
+ if (page_ref_sub_and_test(page, PTE_FRAG_NR - count)) {
pgtable_page_dtor(page);
free_hot_cold_page(page, 0);
}
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index cdf2123..d9cc66c 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -403,7 +403,7 @@ static pte_t *__alloc_for_cache(struct mm_struct *mm, int kernel)
* count.
*/
if (likely(!mm->context.pte_frag)) {
- atomic_set(&page->_count, PTE_FRAG_NR);
+ set_page_count(page, PTE_FRAG_NR);
mm->context.pte_frag = ret + PTE_FRAG_SIZE;
}
spin_unlock(&mm->page_table_lock);
diff --git a/arch/powerpc/platforms/512x/mpc512x_shared.c b/arch/powerpc/platforms/512x/mpc512x_shared.c
index 711f3d3..452da23 100644
--- a/arch/powerpc/platforms/512x/mpc512x_shared.c
+++ b/arch/powerpc/platforms/512x/mpc512x_shared.c
@@ -188,7 +188,7 @@ static struct fsl_diu_shared_fb __attribute__ ((__aligned__(8))) diu_shared_fb;
static inline void mpc512x_free_bootmem(struct page *page)
{
BUG_ON(PageTail(page));
- BUG_ON(atomic_read(&page->_count) > 1);
+ BUG_ON(page_ref_count(page) > 1);
free_reserved_page(page);
}
diff --git a/arch/x86/mm/gup.c b/arch/x86/mm/gup.c
index d8a798d..f8d0b5e 100644
--- a/arch/x86/mm/gup.c
+++ b/arch/x86/mm/gup.c
@@ -131,7 +131,7 @@ static inline void get_head_page_multiple(struct page *page, int nr)
{
VM_BUG_ON_PAGE(page != compound_head(page), page);
VM_BUG_ON_PAGE(page_count(page) == 0, page);
- atomic_add(nr, &page->_count);
+ page_ref_add(page, nr);
SetPageReferenced(page);
}
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index d048d20..437b3a8 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -875,7 +875,7 @@ bio_pageinc(struct bio *bio)
* compound pages is no longer allowed by the kernel.
*/
page = compound_head(bv.bv_page);
- atomic_inc(&page->_count);
+ page_ref_inc(page);
}
}
@@ -888,7 +888,7 @@ bio_pagedec(struct bio *bio)
bio_for_each_segment(bv, bio, iter) {
page = compound_head(bv.bv_page);
- atomic_dec(&page->_count);
+ page_ref_dec(page);
}
}
diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index b9ecf19..f21b2c4 100644
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -2944,7 +2944,7 @@ static bool gfar_add_rx_frag(struct gfar_rx_buff *rxb, u32 lstatus,
/* change offset to the other half */
rxb->page_offset ^= GFAR_RXB_TRUESIZE;
- atomic_inc(&page->_count);
+ page_ref_inc(page);
return true;
}
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_main.c b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
index b243c3c..b4547eb 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_main.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
@@ -243,7 +243,7 @@ static bool fm10k_can_reuse_rx_page(struct fm10k_rx_buffer *rx_buffer,
/* Even if we own the page, we are not allowed to use atomic_set()
* This would break get_page_unless_zero() users.
*/
- atomic_inc(&page->_count);
+ page_ref_inc(page);
return true;
}
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 31e5f39..5b4ad1a 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -6630,7 +6630,7 @@ static bool igb_can_reuse_rx_page(struct igb_rx_buffer *rx_buffer,
/* Even if we own the page, we are not allowed to use atomic_set()
* This would break get_page_unless_zero() users.
*/
- atomic_inc(&page->_count);
+ page_ref_inc(page);
return true;
}
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index c4003a8..e6035ff 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -1942,7 +1942,7 @@ static bool ixgbe_add_rx_frag(struct ixgbe_ring *rx_ring,
/* Even if we own the page, we are not allowed to use atomic_set()
* This would break get_page_unless_zero() users.
*/
- atomic_inc(&page->_count);
+ page_ref_inc(page);
return true;
}
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 3558f01..0ea14c0 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -837,7 +837,7 @@ add_tail_frag:
/* Even if we own the page, we are not allowed to use atomic_set()
* This would break get_page_unless_zero() users.
*/
- atomic_inc(&page->_count);
+ page_ref_inc(page);
return true;
}
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index 41440b2..86bcfe5 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -82,8 +82,7 @@ static int mlx4_alloc_pages(struct mlx4_en_priv *priv,
/* Not doing get_page() for each frag is a big win
* on asymetric workloads. Note we can not use atomic_set().
*/
- atomic_add(page_alloc->page_size / frag_info->frag_stride - 1,
- &page->_count);
+ page_ref_add(page, page_alloc->page_size / frag_info->frag_stride - 1);
return 0;
}
@@ -127,7 +126,7 @@ out:
dma_unmap_page(priv->ddev, page_alloc[i].dma,
page_alloc[i].page_size, PCI_DMA_FROMDEVICE);
page = page_alloc[i].page;
- atomic_set(&page->_count, 1);
+ set_page_count(page, 1);
put_page(page);
}
}
@@ -165,7 +164,7 @@ static int mlx4_en_init_allocator(struct mlx4_en_priv *priv,
en_dbg(DRV, priv, " frag %d allocator: - size:%d frags:%d\n",
i, ring->page_alloc[i].page_size,
- atomic_read(&ring->page_alloc[i].page->_count));
+ page_ref_count(ring->page_alloc[i].page));
}
return 0;
@@ -177,7 +176,7 @@ out:
dma_unmap_page(priv->ddev, page_alloc->dma,
page_alloc->page_size, PCI_DMA_FROMDEVICE);
page = page_alloc->page;
- atomic_set(&page->_count, 1);
+ set_page_count(page, 1);
put_page(page);
page_alloc->page = NULL;
}
diff --git a/drivers/net/ethernet/sun/niu.c b/drivers/net/ethernet/sun/niu.c
index ab6051a..9cc4564 100644
--- a/drivers/net/ethernet/sun/niu.c
+++ b/drivers/net/ethernet/sun/niu.c
@@ -3341,7 +3341,7 @@ static int niu_rbr_add_page(struct niu *np, struct rx_ring_info *rp,
niu_hash_page(rp, page, addr);
if (rp->rbr_blocks_per_page > 1)
- atomic_add(rp->rbr_blocks_per_page - 1, &page->_count);
+ page_ref_add(page, rp->rbr_blocks_per_page - 1);
for (i = 0; i < rp->rbr_blocks_per_page; i++) {
__le32 *rbr = &rp->rbr[start_index + i];
diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index 45d650a..c20df77 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -180,7 +180,7 @@ void nilfs_page_bug(struct page *page)
printk(KERN_CRIT "NILFS_PAGE_BUG(%p): cnt=%d index#=%llu flags=0x%lx "
"mapping=%p ino=%lu\n",
- page, atomic_read(&page->_count),
+ page, page_ref_count(page),
(unsigned long long)page->index, page->flags, m, ino);
if (page_has_buffers(page)) {
diff --git a/include/linux/mm.h b/include/linux/mm.h
index f7fd642..997fc2e 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -22,6 +22,7 @@
#include <linux/resource.h>
#include <linux/page_ext.h>
#include <linux/err.h>
+#include <linux/page_ref.h>
struct mempolicy;
struct anon_vma;
@@ -386,8 +387,8 @@ static inline int pmd_devmap(pmd_t pmd)
*/
static inline int put_page_testzero(struct page *page)
{
- VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0, page);
- return atomic_dec_and_test(&page->_count);
+ VM_BUG_ON_PAGE(page_ref_count(page) == 0, page);
+ return page_ref_dec_and_test(page);
}
/*
@@ -398,7 +399,7 @@ static inline int put_page_testzero(struct page *page)
*/
static inline int get_page_unless_zero(struct page *page)
{
- return atomic_inc_not_zero(&page->_count);
+ return page_ref_add_unless(page, 1, 0);
}
extern int page_is_ram(unsigned long pfn);
@@ -486,11 +487,6 @@ static inline int total_mapcount(struct page *page)
}
#endif
-static inline int page_count(struct page *page)
-{
- return atomic_read(&compound_head(page)->_count);
-}
-
static inline struct page *virt_to_head_page(const void *x)
{
struct page *page = virt_to_page(x);
@@ -498,15 +494,6 @@ static inline struct page *virt_to_head_page(const void *x)
return compound_head(page);
}
-/*
- * Setup the page count before being freed into the page allocator for
- * the first time (boot or memory hotplug)
- */
-static inline void init_page_count(struct page *page)
-{
- atomic_set(&page->_count, 1);
-}
-
void __put_page(struct page *page);
void put_pages_list(struct list_head *pages);
@@ -716,8 +703,8 @@ static inline void get_page(struct page *page)
* Getting a normal page or the head of a compound page
* requires to already have an elevated page->_count.
*/
- VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page);
- atomic_inc(&page->_count);
+ VM_BUG_ON_PAGE(page_ref_count(page) <= 0, page);
+ page_ref_inc(page);
if (unlikely(is_zone_device_page(page)))
get_zone_device_page(page);
diff --git a/include/linux/page_ref.h b/include/linux/page_ref.h
new file mode 100644
index 0000000..30f5817
--- /dev/null
+++ b/include/linux/page_ref.h
@@ -0,0 +1,85 @@
+#ifndef _LINUX_PAGE_REF_H
+#define _LINUX_PAGE_REF_H
+
+#include <linux/atomic.h>
+#include <linux/mm_types.h>
+#include <linux/page-flags.h>
+
+static inline int page_ref_count(struct page *page)
+{
+ return atomic_read(&page->_count);
+}
+
+static inline int page_count(struct page *page)
+{
+ return atomic_read(&compound_head(page)->_count);
+}
+
+static inline void set_page_count(struct page *page, int v)
+{
+ atomic_set(&page->_count, v);
+}
+
+/*
+ * Setup the page count before being freed into the page allocator for
+ * the first time (boot or memory hotplug)
+ */
+static inline void init_page_count(struct page *page)
+{
+ set_page_count(page, 1);
+}
+
+static inline void page_ref_add(struct page *page, int nr)
+{
+ atomic_add(nr, &page->_count);
+}
+
+static inline void page_ref_sub(struct page *page, int nr)
+{
+ atomic_sub(nr, &page->_count);
+}
+
+static inline void page_ref_inc(struct page *page)
+{
+ atomic_inc(&page->_count);
+}
+
+static inline void page_ref_dec(struct page *page)
+{
+ atomic_dec(&page->_count);
+}
+
+static inline int page_ref_sub_and_test(struct page *page, int nr)
+{
+ return atomic_sub_and_test(nr, &page->_count);
+}
+
+static inline int page_ref_dec_and_test(struct page *page)
+{
+ return atomic_dec_and_test(&page->_count);
+}
+
+static inline int page_ref_dec_return(struct page *page)
+{
+ return atomic_dec_return(&page->_count);
+}
+
+static inline int page_ref_add_unless(struct page *page, int nr, int u)
+{
+ return atomic_add_unless(&page->_count, nr, u);
+}
+
+static inline int page_ref_freeze(struct page *page, int count)
+{
+ return likely(atomic_cmpxchg(&page->_count, count, 0) == count);
+}
+
+static inline void page_ref_unfreeze(struct page *page, int count)
+{
+ VM_BUG_ON_PAGE(page_count(page) != 0, page);
+ VM_BUG_ON(count == 0);
+
+ atomic_set(&page->_count, count);
+}
+
+#endif
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 183b15e..1ebd65c 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -165,7 +165,7 @@ static inline int page_cache_get_speculative(struct page *page)
* SMP requires.
*/
VM_BUG_ON_PAGE(page_count(page) == 0, page);
- atomic_inc(&page->_count);
+ page_ref_inc(page);
#else
if (unlikely(!get_page_unless_zero(page))) {
@@ -194,10 +194,10 @@ static inline int page_cache_add_speculative(struct page *page, int count)
VM_BUG_ON(!in_atomic());
# endif
VM_BUG_ON_PAGE(page_count(page) == 0, page);
- atomic_add(count, &page->_count);
+ page_ref_add(page, count);
#else
- if (unlikely(!atomic_add_unless(&page->_count, count, 0)))
+ if (unlikely(!page_ref_add_unless(page, count, 0)))
return 0;
#endif
VM_BUG_ON_PAGE(PageCompound(page) && page != compound_head(page), page);
@@ -205,19 +205,6 @@ static inline int page_cache_add_speculative(struct page *page, int count)
return 1;
}
-static inline int page_freeze_refs(struct page *page, int count)
-{
- return likely(atomic_cmpxchg(&page->_count, count, 0) == count);
-}
-
-static inline void page_unfreeze_refs(struct page *page, int count)
-{
- VM_BUG_ON_PAGE(page_count(page) != 0, page);
- VM_BUG_ON(count == 0);
-
- atomic_set(&page->_count, count);
-}
-
#ifdef CONFIG_NUMA
extern struct page *__page_cache_alloc(gfp_t gfp);
#else
diff --git a/mm/debug.c b/mm/debug.c
index df7247b..8865bfb 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -43,7 +43,7 @@ const struct trace_print_flags vmaflag_names[] = {
void __dump_page(struct page *page, const char *reason)
{
pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx",
- page, atomic_read(&page->_count), page_mapcount(page),
+ page, page_ref_count(page), page_mapcount(page),
page->mapping, page->index);
if (PageCompound(page))
pr_cont(" compound_mapcount: %d", compound_mapcount(page));
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index e08b165..bb944c7 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2888,7 +2888,7 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
page = pmd_page(*pmd);
VM_BUG_ON_PAGE(!page_count(page), page);
- atomic_add(HPAGE_PMD_NR - 1, &page->_count);
+ page_ref_add(page, HPAGE_PMD_NR - 1);
write = pmd_write(*pmd);
young = pmd_young(*pmd);
dirty = pmd_dirty(*pmd);
@@ -3257,7 +3257,7 @@ static void __split_huge_page_tail(struct page *head, int tail,
struct page *page_tail = head + tail;
VM_BUG_ON_PAGE(atomic_read(&page_tail->_mapcount) != -1, page_tail);
- VM_BUG_ON_PAGE(atomic_read(&page_tail->_count) != 0, page_tail);
+ VM_BUG_ON_PAGE(page_ref_count(page_tail) != 0, page_tail);
/*
* tail_page->_count is zero and not changing from under us. But
@@ -3270,7 +3270,7 @@ static void __split_huge_page_tail(struct page *head, int tail,
* atomic_set() here would be safe on all archs (and not only on x86),
* it's safer to use atomic_inc().
*/
- atomic_inc(&page_tail->_count);
+ page_ref_inc(page_tail);
page_tail->flags &= ~PAGE_FLAGS_CHECK_AT_PREP;
page_tail->flags |= (head->flags &
diff --git a/mm/internal.h b/mm/internal.h
index 4042a8a..57d7b0e 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -38,11 +38,6 @@
void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
unsigned long floor, unsigned long ceiling);
-static inline void set_page_count(struct page *page, int v)
-{
- atomic_set(&page->_count, v);
-}
-
extern int __do_page_cache_readahead(struct address_space *mapping,
struct file *filp, pgoff_t offset, unsigned long nr_to_read,
unsigned long lookahead_size);
@@ -64,7 +59,7 @@ static inline unsigned long ra_submit(struct file_ra_state *ra,
static inline void set_page_refcounted(struct page *page)
{
VM_BUG_ON_PAGE(PageTail(page), page);
- VM_BUG_ON_PAGE(atomic_read(&page->_count), page);
+ VM_BUG_ON_PAGE(page_ref_count(page), page);
set_page_count(page, 1);
}
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index c832ef3..e62aa07 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -167,7 +167,7 @@ void get_page_bootmem(unsigned long info, struct page *page,
page->lru.next = (struct list_head *) type;
SetPagePrivate(page);
set_page_private(page, info);
- atomic_inc(&page->_count);
+ page_ref_inc(page);
}
void put_page_bootmem(struct page *page)
@@ -178,7 +178,7 @@ void put_page_bootmem(struct page *page)
BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE ||
type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE);
- if (atomic_dec_return(&page->_count) == 1) {
+ if (page_ref_dec_return(page) == 1) {
ClearPagePrivate(page);
set_page_private(page, 0);
INIT_LIST_HEAD(&page->lru);
diff --git a/mm/migrate.c b/mm/migrate.c
index fdaf081..577c94b 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -349,7 +349,7 @@ int migrate_page_move_mapping(struct address_space *mapping,
return -EAGAIN;
}
- if (!page_freeze_refs(page, expected_count)) {
+ if (!page_ref_freeze(page, expected_count)) {
spin_unlock_irq(&mapping->tree_lock);
return -EAGAIN;
}
@@ -363,7 +363,7 @@ int migrate_page_move_mapping(struct address_space *mapping,
*/
if (mode == MIGRATE_ASYNC && head &&
!buffer_migrate_lock_buffers(head, mode)) {
- page_unfreeze_refs(page, expected_count);
+ page_ref_unfreeze(page, expected_count);
spin_unlock_irq(&mapping->tree_lock);
return -EAGAIN;
}
@@ -397,7 +397,7 @@ int migrate_page_move_mapping(struct address_space *mapping,
* to one less reference.
* We know this isn't the last reference.
*/
- page_unfreeze_refs(page, expected_count - 1);
+ page_ref_unfreeze(page, expected_count - 1);
spin_unlock(&mapping->tree_lock);
/* Leave irq disabled to prevent preemption while updating stats */
@@ -451,7 +451,7 @@ int migrate_huge_page_move_mapping(struct address_space *mapping,
return -EAGAIN;
}
- if (!page_freeze_refs(page, expected_count)) {
+ if (!page_ref_freeze(page, expected_count)) {
spin_unlock_irq(&mapping->tree_lock);
return -EAGAIN;
}
@@ -463,7 +463,7 @@ int migrate_huge_page_move_mapping(struct address_space *mapping,
radix_tree_replace_slot(pslot, newpage);
- page_unfreeze_refs(page, expected_count - 1);
+ page_ref_unfreeze(page, expected_count - 1);
spin_unlock_irq(&mapping->tree_lock);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 096a00d..30134a8 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -766,7 +766,7 @@ static inline int free_pages_check(struct page *page)
bad_reason = "nonzero mapcount";
if (unlikely(page->mapping != NULL))
bad_reason = "non-NULL mapping";
- if (unlikely(atomic_read(&page->_count) != 0))
+ if (unlikely(page_ref_count(page) != 0))
bad_reason = "nonzero _count";
if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_FREE)) {
bad_reason = "PAGE_FLAGS_CHECK_AT_FREE flag(s) set";
@@ -1462,7 +1462,7 @@ static inline int check_new_page(struct page *page)
bad_reason = "nonzero mapcount";
if (unlikely(page->mapping != NULL))
bad_reason = "non-NULL mapping";
- if (unlikely(atomic_read(&page->_count) != 0))
+ if (unlikely(page_ref_count(page) != 0))
bad_reason = "nonzero _count";
if (unlikely(page->flags & __PG_HWPOISON)) {
bad_reason = "HWPoisoned (hardware-corrupted)";
@@ -3475,7 +3475,7 @@ refill:
/* Even if we own the page, we do not use atomic_set().
* This would break get_page_unless_zero() users.
*/
- atomic_add(size - 1, &page->_count);
+ page_ref_add(page, size - 1);
/* reset page count bias and offset to start of new frag */
nc->pfmemalloc = page_is_pfmemalloc(page);
@@ -3487,7 +3487,7 @@ refill:
if (unlikely(offset < 0)) {
page = virt_to_page(nc->va);
- if (!atomic_sub_and_test(nc->pagecnt_bias, &page->_count))
+ if (!page_ref_sub_and_test(page, nc->pagecnt_bias))
goto refill;
#if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE)
@@ -3495,7 +3495,7 @@ refill:
size = nc->size;
#endif
/* OK, page count is 0, we can safely set it */
- atomic_set(&page->_count, size);
+ set_page_count(page, size);
/* reset page count bias and offset to start of new frag */
nc->pagecnt_bias = size;
@@ -6852,7 +6852,7 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
* This check already skips compound tails of THP
* because their page->_count is zero at all time.
*/
- if (!atomic_read(&page->_count)) {
+ if (!page_ref_count(page)) {
if (PageBuddy(page))
iter += (1 << page_order(page)) - 1;
continue;
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b41b82d..b934223e 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -638,11 +638,11 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
* Note that if SetPageDirty is always performed via set_page_dirty,
* and thus under tree_lock, then this ordering is not required.
*/
- if (!page_freeze_refs(page, 2))
+ if (!page_ref_freeze(page, 2))
goto cannot_free;
/* note: atomic_cmpxchg in page_freeze_refs provides the smp_rmb */
if (unlikely(PageDirty(page))) {
- page_unfreeze_refs(page, 2);
+ page_ref_unfreeze(page, 2);
goto cannot_free;
}
@@ -704,7 +704,7 @@ int remove_mapping(struct address_space *mapping, struct page *page)
* drops the pagecache ref for us without requiring another
* atomic operation.
*/
- page_unfreeze_refs(page, 1);
+ page_ref_unfreeze(page, 1);
return 1;
}
return 0;
diff --git a/net/core/sock.c b/net/core/sock.c
index 6c1c8bc..67e7efe 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1903,7 +1903,7 @@ EXPORT_SYMBOL(sock_cmsg_send);
bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
{
if (pfrag->page) {
- if (atomic_read(&pfrag->page->_count) == 1) {
+ if (page_ref_count(pfrag->page) == 1) {
pfrag->offset = 0;
return true;
}
OpenPOWER on IntegriCloud