From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754472AbbKWQqX (ORCPT ); Mon, 23 Nov 2015 11:46:23 -0500 Received: from mx1.redhat.com ([209.132.183.28]:35179 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753995AbbKWQpt (ORCPT ); Mon, 23 Nov 2015 11:45:49 -0500 From: Vitaly Kuznetsov To: devel@linuxdriverproject.org Cc: "K. Y. Srinivasan" , Haiyang Zhang , linux-kernel@vger.kernel.org Subject: [PATCH 2/3] Drivers: hv: ring_buffer: remove stray smp_read_barrier_depends() Date: Mon, 23 Nov 2015 17:45:41 +0100 Message-Id: <1448297142-11514-3-git-send-email-vkuznets@redhat.com> In-Reply-To: <1448297142-11514-1-git-send-email-vkuznets@redhat.com> References: <1448297142-11514-1-git-send-email-vkuznets@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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