[PATCH RFC PKS/PMEM 31/58] fs/vboxsf: 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: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
---
 fs/vboxsf/file.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/vboxsf/file.c b/fs/vboxsf/file.c
index c4ab5996d97a..d9c7e6b7b4cc 100644
--- a/fs/vboxsf/file.c
+++ b/fs/vboxsf/file.c
@@ -216,7 +216,7 @@ static int vboxsf_readpage(struct file *file, struct page 
*page)
        u8 *buf;
        int err;
 
-       buf = kmap(page);
+       buf = kmap_thread(page);
 
        err = vboxsf_read(sf_handle->root, sf_handle->handle, off, &nread, buf);
        if (err == 0) {
@@ -227,7 +227,7 @@ static int vboxsf_readpage(struct file *file, struct page 
*page)
                SetPageError(page);
        }
 
-       kunmap(page);
+       kunmap_thread(page);
        unlock_page(page);
        return err;
 }
@@ -268,10 +268,10 @@ static int vboxsf_writepage(struct page *page, struct 
writeback_control *wbc)
        if (!sf_handle)
                return -EBADF;
 
-       buf = kmap(page);
+       buf = kmap_thread(page);
        err = vboxsf_write(sf_handle->root, sf_handle->handle,
                           off, &nwrite, buf);
-       kunmap(page);
+       kunmap_thread(page);
 
        kref_put(&sf_handle->refcount, vboxsf_handle_release);
 
@@ -302,10 +302,10 @@ static int vboxsf_write_end(struct file *file, struct 
address_space *mapping,
        if (!PageUptodate(page) && copied < len)
                zero_user(page, from + copied, len - copied);
 
-       buf = kmap(page);
+       buf = kmap_thread(page);
        err = vboxsf_write(sf_handle->root, sf_handle->handle,
                           pos, &nwritten, buf + from);
-       kunmap(page);
+       kunmap_thread(page);
 
        if (err) {
                nwritten = 0;
-- 
2.28.0.rc0.12.gb6a658bd00c9