linux-kernel - [PATCH] nommu: allow mmap when !CONFIG

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Date:   Thu,  1 Dec 2016 14:48:00 +0100
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     linux@...linux.org.uk, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Robin.Murphy@....com
Cc:     Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>, arnd@...db.de
Subject: [PATCH] nommu: allow mmap when !CONFIG_MMU

commit ab6494f0c96f ("nommu: Add noMMU support to the DMA API") have
add CONFIG_MMU compilation flag but that prohibit to use dma_mmap_wc()
when the platform doesn't have MMU.

This patch call vm_iomap_memory() in noMMU case to test if addresses
are correct and set wma->vm_flags rather than all return an error.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: arnd@...db.de
---
 arch/arm/mm/dma-mapping.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index ab4f745..230875e 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -868,6 +868,9 @@ static int __arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
 				      vma->vm_end - vma->vm_start,
 				      vma->vm_page_prot);
 	}
+#else
+	ret = vm_iomap_memory(vma, vma->vm_start,
+			      (vma->vm_end - vma->vm_start));
 #endif	/* CONFIG_MMU */
 
 	return ret;
-- 
1.9.1