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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>
This commit is contained in:
Vitaly Kuznetsov 2015-12-14 19:01:58 -08:00 committed by Greg Kroah-Hartman
parent 822f18d4d3
commit 45870a4413
1 changed files with 0 additions and 2 deletions
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2
include/linux/hyperv.h
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@ -141,8 +141,6 @@ hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
{ {
u32 read_loc, write_loc, dsize; u32 read_loc, write_loc, dsize;
smp_read_barrier_depends();
/* Capture the read/write indices before they changed */ /* Capture the read/write indices before they changed */
read_loc = rbi->ring_buffer->read_index; read_loc = rbi->ring_buffer->read_index;
write_loc = rbi->ring_buffer->write_index; write_loc = rbi->ring_buffer->write_index;