Merge tag 'stable/frontswap.v16-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/mm

Pull frontswap feature from Konrad Rzeszutek Wilk:
 "Frontswap provides a "transcendent memory" interface for swap pages.
  In some environments, dramatic performance savings may be obtained
  because swapped pages are saved in RAM (or a RAM-like device) instead
  of a swap disk.  This tag provides the basic infrastructure along with
  some changes to the existing backends."

Fix up trivial conflict in mm/Makefile due to removal of swap token code
changing a line next to the new frontswap entry.

This pull request came in before the merge window even opened, it got
delayed to after the merge window by me just wanting to make sure it had
actual users.  Apparently IBM is using this on their embedded side, and
Jan Beulich says that it's already made available for SLES and OpenSUSE
users.

Also acked by Rik van Riel, and Konrad points to other people liking it
too.  So in it goes.

By Dan Magenheimer (4) and Konrad Rzeszutek Wilk (2)
via Konrad Rzeszutek Wilk
* tag 'stable/frontswap.v16-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/mm:
  frontswap: s/put_page/store/g s/get_page/load
  MAINTAINER: Add myself for the frontswap API
  mm: frontswap: config and doc files
  mm: frontswap: core frontswap functionality
  mm: frontswap: core swap subsystem hooks and headers
  mm: frontswap: add frontswap header file

3 files changed, 13 insertions, 13 deletions

diff --git a/drivers/staging/ramster/zcache-main.c b/drivers/staging/ramster/zcache-main.c
index 4e7ef0e6b79..d46764b5aab 100644
--- a/drivers/staging/ramster/zcache-main.c
+++ b/drivers/staging/ramster/zcache-main.c
@@ -3002,7 +3002,7 @@ static inline struct tmem_oid oswiz(unsigned type, u32 ind)
 	return oid;
 }
 
-static int zcache_frontswap_put_page(unsigned type, pgoff_t offset,
+static int zcache_frontswap_store(unsigned type, pgoff_t offset,
 				   struct page *page)
 {
 	u64 ind64 = (u64)offset;
@@ -3025,7 +3025,7 @@ static int zcache_frontswap_put_page(unsigned type, pgoff_t offset,
 
 /* returns 0 if the page was successfully gotten from frontswap, -1 if
  * was not present (should never happen!) */
-static int zcache_frontswap_get_page(unsigned type, pgoff_t offset,
+static int zcache_frontswap_load(unsigned type, pgoff_t offset,
 				   struct page *page)
 {
 	u64 ind64 = (u64)offset;
@@ -3080,8 +3080,8 @@ static void zcache_frontswap_init(unsigned ignored)
 }
 
 static struct frontswap_ops zcache_frontswap_ops = {
-	.put_page = zcache_frontswap_put_page,
-	.get_page = zcache_frontswap_get_page,
+	.store = zcache_frontswap_store,
+	.load = zcache_frontswap_load,
 	.invalidate_page = zcache_frontswap_flush_page,
 	.invalidate_area = zcache_frontswap_flush_area,
 	.init = zcache_frontswap_init
diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index 2734dacacba..784c796b984 100644
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -1835,7 +1835,7 @@ static int zcache_frontswap_poolid = -1;
  * Swizzling increases objects per swaptype, increasing tmem concurrency
  * for heavy swaploads.  Later, larger nr_cpus -> larger SWIZ_BITS
  * Setting SWIZ_BITS to 27 basically reconstructs the swap entry from
- * frontswap_get_page(), but has side-effects. Hence using 8.
+ * frontswap_load(), but has side-effects. Hence using 8.
  */
 #define SWIZ_BITS		8
 #define SWIZ_MASK		((1 << SWIZ_BITS) - 1)
@@ -1849,7 +1849,7 @@ static inline struct tmem_oid oswiz(unsigned type, u32 ind)
 	return oid;
 }
 
-static int zcache_frontswap_put_page(unsigned type, pgoff_t offset,
+static int zcache_frontswap_store(unsigned type, pgoff_t offset,
 				   struct page *page)
 {
 	u64 ind64 = (u64)offset;
@@ -1870,7 +1870,7 @@ static int zcache_frontswap_put_page(unsigned type, pgoff_t offset,
 
 /* returns 0 if the page was successfully gotten from frontswap, -1 if
  * was not present (should never happen!) */
-static int zcache_frontswap_get_page(unsigned type, pgoff_t offset,
+static int zcache_frontswap_load(unsigned type, pgoff_t offset,
 				   struct page *page)
 {
 	u64 ind64 = (u64)offset;
@@ -1919,8 +1919,8 @@ static void zcache_frontswap_init(unsigned ignored)
 }
 
 static struct frontswap_ops zcache_frontswap_ops = {
-	.put_page = zcache_frontswap_put_page,
-	.get_page = zcache_frontswap_get_page,
+	.store = zcache_frontswap_store,
+	.load = zcache_frontswap_load,
 	.invalidate_page = zcache_frontswap_flush_page,
 	.invalidate_area = zcache_frontswap_flush_area,
 	.init = zcache_frontswap_init
diff --git a/drivers/xen/tmem.c b/drivers/xen/tmem.c
index dcb79521e6c..89f264c6742 100644
--- a/drivers/xen/tmem.c
+++ b/drivers/xen/tmem.c
@@ -269,7 +269,7 @@ static inline struct tmem_oid oswiz(unsigned type, u32 ind)
 }
 
 /* returns 0 if the page was successfully put into frontswap, -1 if not */
-static int tmem_frontswap_put_page(unsigned type, pgoff_t offset,
+static int tmem_frontswap_store(unsigned type, pgoff_t offset,
 				   struct page *page)
 {
 	u64 ind64 = (u64)offset;
@@ -295,7 +295,7 @@ static int tmem_frontswap_put_page(unsigned type, pgoff_t offset,
  * returns 0 if the page was successfully gotten from frontswap, -1 if
  * was not present (should never happen!)
  */
-static int tmem_frontswap_get_page(unsigned type, pgoff_t offset,
+static int tmem_frontswap_load(unsigned type, pgoff_t offset,
 				   struct page *page)
 {
 	u64 ind64 = (u64)offset;
@@ -362,8 +362,8 @@ static int __init no_frontswap(char *s)
 __setup("nofrontswap", no_frontswap);
 
 static struct frontswap_ops __initdata tmem_frontswap_ops = {
-	.put_page = tmem_frontswap_put_page,
-	.get_page = tmem_frontswap_get_page,
+	.store = tmem_frontswap_store,
+	.load = tmem_frontswap_load,
 	.invalidate_page = tmem_frontswap_flush_page,
 	.invalidate_area = tmem_frontswap_flush_area,
 	.init = tmem_frontswap_init