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From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, David Hildenbrand <david@redhat.com>,
	Joel Stanley <joel@jms.id.au>, David Airlie <airlied@linux.ie>,
	Daniel Vetter <daniel@ffwll.ch>, Andrew Jeffery <andrew@aj.id.au>,
	Lucas Stach <l.stach@pengutronix.de>,
	Russell King <linux+etnaviv@armlinux.org.uk>,
	Christian Gmeiner <christian.gmeiner@gmail.com>,
	Mike Rapoport <rppt@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Michal Simek <michal.simek@xilinx.com>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Randy Dunlap <rdunlap@infradead.org>,
	Peter Collingbourne <pcc@google.com>,
	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: [PATCH v1 1/2] drivers/video/fbdev: don't select DMA_CMA
Date: Thu,  8 Apr 2021 11:20:10 +0200	[thread overview]
Message-ID: <20210408092011.52763-2-david@redhat.com> (raw)
In-Reply-To: <20210408092011.52763-1-david@redhat.com>

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.

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 <david@redhat.com>
---
 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


  reply	other threads:[~2021-04-08  9:20 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-08  9:20 [PATCH v1 0/2] drivers: don't select DMA_CMA or CMA David Hildenbrand
2021-04-08  9:20 ` David Hildenbrand [this message]
2021-04-08  9:56   ` [PATCH v1 1/2] drivers/video/fbdev: don't select DMA_CMA Mike Rapoport
2021-04-08  9:20 ` [PATCH v1 2/2] drivers/gpu/drm: don't select DMA_CMA or CMA from aspeed or etnaviv David Hildenbrand
2021-04-08  9:56   ` Mike Rapoport
2021-04-08  9:57     ` David Hildenbrand
2021-04-08 10:20   ` Arnd Bergmann
2021-04-08 10:27     ` David Hildenbrand
2021-04-08 10:36       ` David Hildenbrand
2021-04-08 10:44       ` Arnd Bergmann
2021-04-08 11:00         ` David Hildenbrand
2021-04-08 11:44           ` Arnd Bergmann
2021-04-08 12:00             ` David Hildenbrand
2021-04-08 12:12               ` Arnd Bergmann
2021-04-08 12:49               ` Linus Walleij
2021-04-08 13:19                 ` Arnd Bergmann
2021-04-09  8:07                   ` David Hildenbrand
2021-04-08 16:44                 ` David Hildenbrand
2021-04-08 20:29                   ` Arnd Bergmann
2021-04-09  8:09                     ` David Hildenbrand
2021-04-08 21:45                   ` Linus Walleij
2021-04-08 11:38     ` Daniel Vetter
2021-04-08 16:46       ` Jason Gunthorpe

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