From: Christoph Hellwig Subject: [PATCH 2/3] riscv: only enable ZONE_DMA32 for 64-bit Date: Wed, 16 May 2018 16:43:01 +0200 Message-ID: <20180516144302.823-3-hch@lst.de> References: <20180516144302.823-1-hch@lst.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20180516144302.823-1-hch-jcswGhMUV9g@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: palmer-SpMDHPYPyPbQT0dZR+AlfA@public.gmane.org Cc: linux-riscv-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org List-Id: iommu@lists.linux-foundation.org Until we actually support > 32bit physical addresses for 32-bit using highmem there is no point in enabling ZONE_DMA32. And even if such support is ever added it probably should be conditional to not burden low end embedded devices. Signed-off-by: Christoph Hellwig --- arch/riscv/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 7817bbe0cfac..c4488ce8c2fa 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -48,7 +48,7 @@ config MMU config ZONE_DMA32 bool - default y + default y if 64BIT config PAGE_OFFSET hex -- 2.17.0