Commit 45870a44 authored Dec 14, 2015 by Vitaly Kuznetsov Committed by Greg Kroah-Hartman Dec 14, 2015

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>

parent 822f18d4

include/linux/hyperv.h

+0 −2

Original line number	Diff line number	Diff line
		@@ -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;