[03/13] frontswap: remove frontswap_tmem_exclusive_gets

Commit Message

Christoph Hellwig Dec. 24, 2021, 6:22 a.m. UTC

frontswap_tmem_exclusive_gets is never called, so remove it.

Signed-off-by: Christoph Hellwig <[e-mail]>
---
 include/linux/frontswap.h |  2 --
 mm/frontswap.c            | 23 +----------------------
 2 files changed, 1 insertion(+), 24 deletions(-)

Patch

diff --git a/include/linux/frontswap.h b/include/linux/frontswap.h
index 4a03fda415725..83a56392cc7f6 100644
--- a/include/linux/frontswap.h
+++ b/include/linux/frontswap.h
@@ -26,8 +26,6 @@  struct frontswap_ops {
 extern void frontswap_register_ops(struct frontswap_ops *ops);
 extern void frontswap_shrink(unsigned long);
 extern unsigned long frontswap_curr_pages(void);
-#define FRONTSWAP_HAS_EXCLUSIVE_GETS
-extern void frontswap_tmem_exclusive_gets(bool);
 
 extern bool __frontswap_test(struct swap_info_struct *, pgoff_t);
 extern void __frontswap_init(unsigned type, unsigned long *map);
diff --git a/mm/frontswap.c b/mm/frontswap.c
index 51a662a839559..dba7f087ee862 100644
--- a/mm/frontswap.c
+++ b/mm/frontswap.c
@@ -32,13 +32,6 @@  static struct frontswap_ops *frontswap_ops __read_mostly;
 #define for_each_frontswap_ops(ops)		\
 	for ((ops) = frontswap_ops; (ops); (ops) = (ops)->next)
 
-/*
- * If enabled, the underlying tmem implementation is capable of doing
- * exclusive gets, so frontswap_load, on a successful tmem_get must
- * mark the page as no longer in frontswap AND mark it dirty.
- */
-static bool frontswap_tmem_exclusive_gets_enabled __read_mostly;
-
 #ifdef CONFIG_DEBUG_FS
 /*
  * Counters available via /sys/kernel/debug/frontswap (if debugfs is
@@ -160,15 +153,6 @@  void frontswap_register_ops(struct frontswap_ops *ops)
 }
 EXPORT_SYMBOL(frontswap_register_ops);
 
-/*
- * Enable/disable frontswap exclusive gets (see above).
- */
-void frontswap_tmem_exclusive_gets(bool enable)
-{
-	frontswap_tmem_exclusive_gets_enabled = enable;
-}
-EXPORT_SYMBOL(frontswap_tmem_exclusive_gets);
-
 /*
  * Called when a swap device is swapon'd.
  */
@@ -296,13 +280,8 @@  int __frontswap_load(struct page *page)
 		if (!ret) /* successful load */
 			break;
 	}
-	if (ret == 0) {
+	if (ret == 0)
 		inc_frontswap_loads();
-		if (frontswap_tmem_exclusive_gets_enabled) {
-			SetPageDirty(page);
-			__frontswap_clear(sis, offset);
-		}
-	}
 	return ret;
 }
 EXPORT_SYMBOL(__frontswap_load);