Merge tag 'libnvdimm-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm...

[cascardo/linux.git] / fs / dax.c

diff --git a/fs/dax.c b/fs/dax.c
index 432b9e6..993dc6f 100644 (file)
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -75,13 +75,13 @@ static long dax_map_atomic(struct block_device *bdev, struct blk_dax_ctl *dax)
        struct request_queue *q = bdev->bd_queue;
        long rc = -EIO;
 
-       dax->addr = (void __pmem *) ERR_PTR(-EIO);
+       dax->addr = ERR_PTR(-EIO);
        if (blk_queue_enter(q, true) != 0)
                return rc;
 
        rc = bdev_direct_access(bdev, dax);
        if (rc < 0) {
-               dax->addr = (void __pmem *) ERR_PTR(rc);
+               dax->addr = ERR_PTR(rc);
                blk_queue_exit(q);
                return rc;
        }
@@ -147,12 +147,12 @@ static ssize_t dax_io(struct inode *inode, struct iov_iter *iter,
                      struct buffer_head *bh)
 {
        loff_t pos = start, max = start, bh_max = start;
-       bool hole = false, need_wmb = false;
+       bool hole = false;
        struct block_device *bdev = NULL;
        int rw = iov_iter_rw(iter), rc;
        long map_len = 0;
        struct blk_dax_ctl dax = {
-               .addr = (void __pmem *) ERR_PTR(-EIO),
+               .addr = ERR_PTR(-EIO),
        };
        unsigned blkbits = inode->i_blkbits;
        sector_t file_blks = (i_size_read(inode) + (1 << blkbits) - 1)
@@ -218,7 +218,6 @@ static ssize_t dax_io(struct inode *inode, struct iov_iter *iter,
 
                if (iov_iter_rw(iter) == WRITE) {
                        len = copy_from_iter_pmem(dax.addr, max - pos, iter);
-                       need_wmb = true;
                } else if (!hole)
                        len = copy_to_iter((void __force *) dax.addr, max - pos,
                                        iter);
@@ -235,8 +234,6 @@ static ssize_t dax_io(struct inode *inode, struct iov_iter *iter,
                        dax.addr += len;
        }
 
-       if (need_wmb)
-               wmb_pmem();
        dax_unmap_atomic(bdev, &dax);
 
        return (pos == start) ? rc : pos - start;
@@ -788,7 +785,6 @@ int dax_writeback_mapping_range(struct address_space *mapping,
                                return ret;
                }
        }
-       wmb_pmem();
        return 0;
 }
 EXPORT_SYMBOL_GPL(dax_writeback_mapping_range);
@@ -1187,7 +1183,6 @@ int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
                if (dax_map_atomic(bdev, &dax) < 0)
                        return PTR_ERR(dax.addr);
                clear_pmem(dax.addr + offset, length);
-               wmb_pmem();
                dax_unmap_atomic(bdev, &dax);
        }
        return 0;