pmem: kill wmb_pmem()

All users have been replaced with flushing in the pmem driver.

Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 4 insertions, 43 deletions

diff --git a/include/linux/pmem.h b/include/linux/pmem.h
index 57d146fe44dd..9e3ea94b8157 100644
--- a/include/linux/pmem.h
+++ b/include/linux/pmem.h
@@ -26,16 +26,6 @@
  * calling these symbols with arch_has_pmem_api() and redirect to the
  * implementation in asm/pmem.h.
  */
-static inline bool __arch_has_wmb_pmem(void)
-{
-	return false;
-}
-
-static inline void arch_wmb_pmem(void)
-{
-	BUG();
-}
-
 static inline void arch_memcpy_to_pmem(void __pmem *dst, const void *src,
 		size_t n)
 {
@@ -101,20 +91,6 @@ static inline int memcpy_from_pmem(void *dst, void __pmem const *src,
 		return default_memcpy_from_pmem(dst, src, size);
 }
 
-/**
- * arch_has_wmb_pmem - true if wmb_pmem() ensures durability
- *
- * For a given cpu implementation within an architecture it is possible
- * that wmb_pmem() resolves to a nop.  In the case this returns
- * false, pmem api users are unable to ensure durability and may want to
- * fall back to a different data consistency model, or otherwise notify
- * the user.
- */
-static inline bool arch_has_wmb_pmem(void)
-{
-	return arch_has_pmem_api() && __arch_has_wmb_pmem();
-}
-
 /*
  * These defaults seek to offer decent performance and minimize the
  * window between i/o completion and writes being durable on media.
@@ -152,7 +128,7 @@ static inline void default_clear_pmem(void __pmem *addr, size_t size)
  * being effectively evicted from, or never written to, the processor
  * cache hierarchy after the copy completes.  After memcpy_to_pmem()
  * data may still reside in cpu or platform buffers, so this operation
- * must be followed by a wmb_pmem().
+ * must be followed by a blkdev_issue_flush() on the pmem block device.
  */
 static inline void memcpy_to_pmem(void __pmem *dst, const void *src, size_t n)
 {
@@ -163,28 +139,13 @@ static inline void memcpy_to_pmem(void __pmem *dst, const void *src, size_t n)
 }
 
 /**
- * wmb_pmem - synchronize writes to persistent memory
- *
- * After a series of memcpy_to_pmem() operations this drains data from
- * cpu write buffers and any platform (memory controller) buffers to
- * ensure that written data is durable on persistent memory media.
- */
-static inline void wmb_pmem(void)
-{
-	if (arch_has_wmb_pmem())
-		arch_wmb_pmem();
-	else
-		wmb();
-}
-
-/**
  * copy_from_iter_pmem - copy data from an iterator to PMEM
  * @addr:	PMEM destination address
  * @bytes:	number of bytes to copy
  * @i:		iterator with source data
  *
  * Copy data from the iterator 'i' to the PMEM buffer starting at 'addr'.
- * This function requires explicit ordering with a wmb_pmem() call.
+ * See blkdev_issue_flush() note for memcpy_to_pmem().
  */
 static inline size_t copy_from_iter_pmem(void __pmem *addr, size_t bytes,
 		struct iov_iter *i)
@@ -200,7 +161,7 @@ static inline size_t copy_from_iter_pmem(void __pmem *addr, size_t bytes,
  * @size:	number of bytes to zero
  *
  * Write zeros into the memory range starting at 'addr' for 'size' bytes.
- * This function requires explicit ordering with a wmb_pmem() call.
+ * See blkdev_issue_flush() note for memcpy_to_pmem().
  */
 static inline void clear_pmem(void __pmem *addr, size_t size)
 {
@@ -230,7 +191,7 @@ static inline void invalidate_pmem(void __pmem *addr, size_t size)
  * @size:	number of bytes to write back
  *
  * Write back the processor cache range starting at 'addr' for 'size' bytes.
- * This function requires explicit ordering with a wmb_pmem() call.
+ * See blkdev_issue_flush() note for memcpy_to_pmem().
  */
 static inline void wb_cache_pmem(void __pmem *addr, size_t size)
 {