From patchwork Tue May 3 08:58:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 12835315 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 4FDCEC433F5 for ; Tue, 3 May 2022 08:54:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231320AbiECI6D (ORCPT ); Tue, 3 May 2022 04:58:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36274 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232906AbiECI54 (ORCPT ); Tue, 3 May 2022 04:57:56 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0DC5535DE9 for ; Tue, 3 May 2022 01:54:22 -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 sin.source.kernel.org (Postfix) with ESMTPS id 60E23CE1E67 for ; Tue, 3 May 2022 08:54:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id EF908C385A4; Tue, 3 May 2022 08:54:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1651568058; bh=MqdHuosWBnnyP+/Jrjq2c52P+lAsMXYGETCOBH7CA0c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BRVVrN+z7QtKNGz67/ctStUD6daaSJcQvbQFQ4JPpq4aajRjP/x03Wb4PNegylbaI +1BvZqO426ntqMHPDlia5a3Q0c0CFtnJfL33nxLam6pcFfZr0QQQulMi7pezrxLRKX 0KaktUP8doBPQjxXYhqpVNpRd+gcuhe1twvhULTQ1MZ00yQ9ouaV+pWF3iBksay4Zc WtgxR9x6rNbFg8NkWcYWBkFno0hx09jV3srber/tktVkpq7TR8pDh016EYqZWpRc6X W0reJupLDYZi60FuncIznDpIwoj/+u/cobdEDxwIUlWkOGfk9dufidP/IvN2KuIdmT Q7GC1qvQTcPmw== 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 16/92] iio: adc: ad7768-1: Fix alignment for DMA safety Date: Tue, 3 May 2022 09:58:19 +0100 Message-Id: <20220503085935.1533814-17-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 reflect that separate cachelines 'may' be required. Fixes: a5f8c7da3dbe ("iio: adc: Add AD7768-1 ADC basic support") Signed-off-by: Jonathan Cameron --- drivers/iio/adc/ad7768-1.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c index aa42ba759fa1..325d3aba5abb 100644 --- a/drivers/iio/adc/ad7768-1.c +++ b/drivers/iio/adc/ad7768-1.c @@ -163,7 +163,7 @@ struct ad7768_state { struct gpio_desc *gpio_sync_in; const char *labels[ARRAY_SIZE(ad7768_channels)]; /* - * 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 { @@ -173,7 +173,7 @@ struct ad7768_state { } scan; __be32 d32; u8 d8[2]; - } data ____cacheline_aligned; + } data __aligned(IIO_ALIGN); }; static int ad7768_spi_reg_read(struct ad7768_state *st, unsigned int addr,