linux-kernel - [PATCH] arm: dma-mapping: fix compilation error when CONFIG

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Date:	Sun, 19 Oct 2014 17:59:00 +0200
From:	Stefan Hengelein <stefan.hengelein@....de>
To:	linux-kernel@...r.kernel.org
Cc:	linux@....linux.org.uk, m.szyprowski@...sung.com,
	akpm@...ux-foundation.org, lauraa@...eaurora.org,
	linux-arm-kernel@...ts.infradead.org, andreas.herrmann@...xeda.com,
	Stefan Hengelein <stefan.hengelein@....de>
Subject: [PATCH] arm: dma-mapping: fix compilation error when CONFIG_MMU is not present

When CONFIG_MMU is not present, the variable 'atomic_pool' and the
function '__in_atomic_pool' are undeclared but used in part of the
code. Therefore, the compilation breaks.
Now, they are defined to dummy values when CONFIG_MMU is undefined.

This error was found with vampyr.

Signed-off-by: Stefan Hengelein <stefan.hengelein@....de>
---
 arch/arm/mm/dma-mapping.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index c245d90..7d04cf7 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -573,12 +573,14 @@ static inline pgprot_t __get_dma_pgprot(struct dma_attrs *attrs, pgprot_t prot)
 #else	/* !CONFIG_MMU */
 
 #define nommu() 1
+#define atomic_pool 0
 
 #define __get_dma_pgprot(attrs, prot)	__pgprot(0)
 #define __alloc_remap_buffer(dev, size, gfp, prot, ret, c)	NULL
 #define __alloc_from_pool(size, ret_page)			NULL
 #define __alloc_from_contiguous(dev, size, prot, ret, c)	NULL
 #define __free_from_pool(cpu_addr, size)			0
+#define __in_atomic_pool(start, size)				0
 #define __free_from_contiguous(dev, page, cpu_addr, size)	do { } while (0)
 #define __dma_free_remap(cpu_addr, size)			do { } while (0)
 
-- 
1.9.1

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