From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 63CDBC433B4 for ; Thu, 8 Apr 2021 09:56:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1FB0B610FA for ; Thu, 8 Apr 2021 09:56:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230291AbhDHJ40 (ORCPT ); Thu, 8 Apr 2021 05:56:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:37298 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231308AbhDHJ4Z (ORCPT ); Thu, 8 Apr 2021 05:56:25 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id BF61761157; Thu, 8 Apr 2021 09:56:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1617875774; bh=qJxRS7vx1sXE6xcXQMcJdpuIhDNb8doWc5nvVib8CKg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=KZ/oVYIMYnAgYH6QJVktZeIA6/aSYiWme3mBgwnkCxayRdrH5xziAm66YyvKrRth7 7v9gmEr4vet9wOPetc8R4/QVlcGIuJddziUeRsFMPVcGZa22P9mvPmv43q1B6aD+Js Z0e/fme4iIuOE27WCM3w3jK+/81p4DNorwJ+lgUEckK3vbax8fc4dOwWS9QFQ50bHB QomrNySbhnrnJqtGC3+M/ApvRrBBJ3ceKHuJulDCYWyiIvtQy3nj4mRUzMnqnyL+hH vDqGLXtnBvDVuKNFVaO2Flj0rH/To18bMy5Xeu6DijPGj4p0ZU4/aKk0Y4ceO01yyY OTrdegR9Enwbw== Date: Thu, 8 Apr 2021 12:56:02 +0300 From: Mike Rapoport To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Joel Stanley , David Airlie , Daniel Vetter , Andrew Jeffery , Lucas Stach , Russell King , Christian Gmeiner , Arnd Bergmann , Bartlomiej Zolnierkiewicz , Linus Walleij , Michal Simek , Masahiro Yamada , Randy Dunlap , Peter Collingbourne , linux-aspeed@lists.ozlabs.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, etnaviv@lists.freedesktop.org, linux-fbdev@vger.kernel.org Subject: Re: [PATCH v1 1/2] drivers/video/fbdev: don't select DMA_CMA Message-ID: References: <20210408092011.52763-1-david@redhat.com> <20210408092011.52763-2-david@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210408092011.52763-2-david@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org On Thu, Apr 08, 2021 at 11:20:10AM +0200, David Hildenbrand wrote: > Random drivers should not override a user configuration of core knobs > (e.g., CONFIG_DMA_CMA=n). Use "imply" instead, to still respect > dependencies and manual overrides. > > "This is similar to "select" as it enforces a lower limit on another > symbol except that the "implied" symbol's value may still be set to n > from a direct dependency or with a visible prompt." > > Implying DRM_CMA should be sufficient, as that depends on CMA. ^ DMA_CMA ? > Note: If this is a real dependency, we should use "depends on DMA_CMA" > instead - but I assume the driver can work without CMA just fine -- > esp. when we wouldn't have HAVE_DMA_CONTIGUOUS or CMA right now. > > Signed-off-by: David Hildenbrand > --- > drivers/video/fbdev/Kconfig | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig > index 4f02db65dede..d37cd5341e1b 100644 > --- a/drivers/video/fbdev/Kconfig > +++ b/drivers/video/fbdev/Kconfig > @@ -2186,7 +2186,7 @@ config FB_HYPERV > select FB_CFB_COPYAREA > select FB_CFB_IMAGEBLIT > select FB_DEFERRED_IO > - select DMA_CMA if HAVE_DMA_CONTIGUOUS && CMA > + imply DMA_CMA > help > This framebuffer driver supports Microsoft Hyper-V Synthetic Video. > > -- > 2.30.2 > -- Sincerely yours, Mike.