From: Vitaly Kuznetsov <vkuznets@redhat.com>
Date: Tue, 15 Dec 2015 03:01:58 +0000 (-0800)
Subject: Drivers: hv: ring_buffer: remove stray smp_read_barrier_depends()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=45870a441361d1c05a5f767c4ece2f6e30e0da9c;p=linux-beck.git

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 acd995b81c6b..179ff330af59 100644
--- 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;