Messages in this thread Patch in this message | | | From | Vitaly Kuznetsov <> | Subject | [PATCH 2/3] Drivers: hv: ring_buffer: remove stray smp_read_barrier_depends() | Date | Mon, 23 Nov 2015 17:45:41 +0100 |
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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> --- include/linux/hyperv.h | 2 -- 1 file changed, 2 deletions(-)
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 8fdc17b..1777dc8 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; -- 2.4.3
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