From patchwork Thu May 3 13:36:13 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kieran Bingham X-Patchwork-Id: 49201 X-Patchwork-Delegate: laurent.pinchart@ideasonboard.com Received: from vger.kernel.org ([209.132.180.67]) by www.linuxtv.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fEEPX-0005L8-AP; Thu, 03 May 2018 13:36:39 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751575AbeECNgf (ORCPT + 1 other); Thu, 3 May 2018 09:36:35 -0400 Received: from perceval.ideasonboard.com ([213.167.242.64]:34888 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751380AbeECNg3 (ORCPT ); Thu, 3 May 2018 09:36:29 -0400 Received: from localhost.localdomain (cpc89242-aztw30-2-0-cust488.18-1.cable.virginm.net [86.31.129.233]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id EE69E6179; Thu, 3 May 2018 15:36:26 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1525354587; bh=Pcer3MMyKc+vRes1IjBM6Ak2cR+1EIB+gmxT7le3SDU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:In-Reply-To: References:From; b=dBCSuwSAX48TyfhJtgO5MxBUMYHE+KQ1e2wqrbfDVeib/6XGa3wmv3wJTHDORbi12 QIUxwN1HkIvbop6WbeIpugRyiArn1TiLyw+5pSbuR0k3icQv6otZTU5938+HrG+6er gbW2XNcUcQVZPmZpSeEDh4TiDW1bFIdbhCsGKxEM= From: Kieran Bingham To: Laurent Pinchart , linux-renesas-soc@vger.kernel.org, linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org, Kieran Bingham Subject: [PATCH v4 02/11] media: vsp1: Remove packed attributes from aligned structures Date: Thu, 3 May 2018 14:36:13 +0100 Message-Id: X-Mailer: git-send-email 2.17.0 In-Reply-To: References: In-Reply-To: References: Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org The use of the packed attribute can cause a performance penalty for all accesses to the struct members, as the compiler will assume that the structure has the potential to have an unaligned base. These structures are all correctly aligned and contain no holes, thus the attribute is redundant and negatively impacts performance, so we remove the attributes entirely. Signed-off-by: Kieran Bingham --- v2 - Remove attributes entirely --- drivers/media/platform/vsp1/vsp1_dl.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/media/platform/vsp1/vsp1_dl.c b/drivers/media/platform/vsp1/vsp1_dl.c index c7fa1cb088cd..f4cede9b9b43 100644 --- a/drivers/media/platform/vsp1/vsp1_dl.c +++ b/drivers/media/platform/vsp1/vsp1_dl.c @@ -25,19 +25,19 @@ struct vsp1_dl_header_list { u32 num_bytes; u32 addr; -} __attribute__((__packed__)); +}; struct vsp1_dl_header { u32 num_lists; struct vsp1_dl_header_list lists[8]; u32 next_header; u32 flags; -} __attribute__((__packed__)); +}; struct vsp1_dl_entry { u32 addr; u32 data; -} __attribute__((__packed__)); +}; /** * struct vsp1_dl_body - Display list body