From patchwork Tue May 3 08:58:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 12835344 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 62FACC433F5 for ; Tue, 3 May 2022 08:58:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233082AbiECJC0 (ORCPT ); Tue, 3 May 2022 05:02:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39784 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232655AbiECJC0 (ORCPT ); Tue, 3 May 2022 05:02:26 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A05F036302 for ; Tue, 3 May 2022 01:58:54 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 549B8B81BE2 for ; Tue, 3 May 2022 08:58:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BE0FAC385B0; Tue, 3 May 2022 08:58:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1651568332; bh=L+S6SEplbYu+8Rd1dgvdMo2WXC8htizjfW/0Z07Z0jE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OAcO5aEpaz97LsdbkCkpVHYZwblmN5HY8Rv0gVgxKSO5/39piMPXWaB3KyIEF8Bzz QiFMLU+91CePhr6fauYlJP64QxucFJyNqKqiBtiMbLz8j1PePEPSoA8PlE+WY1M3J3 9el7eo9JSjZvIRKTmXTqY3uCMTng4ClM6IdlDM9q85g5bPB8w/z9kRKdTFfef0KoYF Rthc8vy5oePPxCQ0Ds8e2o34nO3EhlOnJ+dtVNLV1knR+bQObu85XGZ1XKAH6ovaLY xwQ334/FRfZhwCwQJkyXn3IuLHsxUCsu5OO2fQdN53S5zeB5vA+AAJX1glUiBx3l6b /VXs6+NyBxgFg== From: Jonathan Cameron To: linux-iio@vger.kernel.org Cc: Akinobu Mita , Alexandru Lazar , Alexandru Tachici , Antoniu Miclaus , Charles-Antoine Couret , Cosmin Tanislav , Cristian Pop , David Lechner , Ivan Mikhaylov , Jacopo Mondi , Jean-Baptiste Maneyrol , Lars-Peter Clausen , Marcelo Schmitt , =?utf-8?q?M=C3=A5rten_Lindahl?= , Matt Ranostay , Michael Hennerich , Michael Welling , Mugilraj Dhavachelvan , Navin Sankar Velliangiri , =?utf-8?q?Nuno_S=C3=A1?= , Paul Cercueil , Phil Reid , Puranjay Mohan , Ricardo Ribalda , Robert Jones , Rui Miguel Silva , Sean Nyekjaer , Tomas Melin , Tomislav Denis , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Jonathan Cameron Subject: [PATCH 45/92] iio: dac: ad5421: Fix alignment for DMA safety Date: Tue, 3 May 2022 09:58:48 +0100 Message-Id: <20220503085935.1533814-46-jic23@kernel.org> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220503085935.1533814-1-jic23@kernel.org> References: <20220503085935.1533814-1-jic23@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org From: Jonathan Cameron ____cacheline_aligned is an insufficient guarantee for non-coherent DMA on platforms with 128 byte cachelines above L1. Switch to the updated IIO_ALIGN definition. Update the comment to include 'may'. Fixes: 5691b23489db ("staging:iio:dac: Add AD5421 driver") Signed-off-by: Jonathan Cameron Cc: Lars-Peter Clausen --- drivers/iio/dac/ad5421.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iio/dac/ad5421.c b/drivers/iio/dac/ad5421.c index eedf661d32b2..48d36d4a6ff7 100644 --- a/drivers/iio/dac/ad5421.c +++ b/drivers/iio/dac/ad5421.c @@ -72,13 +72,13 @@ struct ad5421_state { struct mutex lock; /* - * DMA (thus cache coherency maintenance) requires the + * DMA (thus cache coherency maintenance) may require the * transfer buffers to live in their own cache lines. */ union { __be32 d32; u8 d8[4]; - } data[2] ____cacheline_aligned; + } data[2] __aligned(IIO_ALIGN); }; static const struct iio_event_spec ad5421_current_event[] = {