[PATCH RFC PKS/PMEM 33/58] fs/cramfs: Utilize new kmap_thread()

[ira.weiny@xxxxxxxxx]

From: Ira Weiny <ira.weiny@xxxxxxxxx>

The kmap() calls in this FS are localized to a single thread.  To avoid
the over head of global PKRS updates use the new kmap_thread() call.

Cc: Nicolas Pitre <nico@xxxxxxxxxxx>
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
---
 fs/cramfs/inode.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c
index 912308600d39..003c014a42ed 100644
--- a/fs/cramfs/inode.c
+++ b/fs/cramfs/inode.c
@@ -247,8 +247,8 @@ static void *cramfs_blkdev_read(struct super_block *sb, 
unsigned int offset,
                struct page *page = pages[i];
 
                if (page) {
-                       memcpy(data, kmap(page), PAGE_SIZE);
-                       kunmap(page);
+                       memcpy(data, kmap_thread(page), PAGE_SIZE);
+                       kunmap_thread(page);
                        put_page(page);
                } else
                        memset(data, 0, PAGE_SIZE);
@@ -826,7 +826,7 @@ static int cramfs_readpage(struct file *file, struct page 
*page)
 
        maxblock = (inode->i_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
        bytes_filled = 0;
-       pgdata = kmap(page);
+       pgdata = kmap_thread(page);
 
        if (page->index < maxblock) {
                struct super_block *sb = inode->i_sb;
@@ -914,13 +914,13 @@ static int cramfs_readpage(struct file *file, struct page 
*page)
 
        memset(pgdata + bytes_filled, 0, PAGE_SIZE - bytes_filled);
        flush_dcache_page(page);
-       kunmap(page);
+       kunmap_thread(page);
        SetPageUptodate(page);
        unlock_page(page);
        return 0;
 
 err:
-       kunmap(page);
+       kunmap_thread(page);
        ClearPageUptodate(page);
        SetPageError(page);
        unlock_page(page);
-- 
2.28.0.rc0.12.gb6a658bd00c9