Drivers: hv: ring_buffer: remove stray smp_read_barrier_depends()

smp_read_barrier_depends() does nothing on almost all arcitectures
including x86 and having it in the beginning of
hv_get_ringbuffer_availbytes() does not provide any guarantees anyway.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index acd995b..179ff33 100644 (file)
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -141,8 +141,6 @@ hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
 {
        u32 read_loc, write_loc, dsize;
 
-       smp_read_barrier_depends();
-
        /* Capture the read/write indices before they changed */
        read_loc = rbi->ring_buffer->read_index;
        write_loc = rbi->ring_buffer->write_index;