[PATCH 7/7] ARM: dma-mapping: Remove traces of NOMMU code

From: Vladimir Murzin
Date: Wed Feb 15 2017 - 05:03:12 EST


DMA operations for NOMMU case have been just factored out into
separate compilation unit, so don't keep dead code.

Tested-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx>
Tested-by: Andras Szemzo <sza@xxxxxx>
Tested-by: Alexandre TORGUE <alexandre.torgue@xxxxxx>
Signed-off-by: Vladimir Murzin <vladimir.murzin@xxxxxxx>
---
arch/arm/mm/dma-mapping.c | 26 ++------------------------
1 file changed, 2 insertions(+), 24 deletions(-)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index ab77100..d8a755b 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -344,8 +344,6 @@ static void __dma_free_buffer(struct page *page, size_t size)
}
}

-#ifdef CONFIG_MMU
-
static void *__alloc_from_contiguous(struct device *dev, size_t size,
pgprot_t prot, struct page **ret_page,
const void *caller, bool want_vaddr,
@@ -646,22 +644,6 @@ static inline pgprot_t __get_dma_pgprot(unsigned long attrs, pgprot_t prot)
return prot;
}

-#define nommu() 0
-
-#else /* !CONFIG_MMU */
-
-#define nommu() 1
-
-#define __get_dma_pgprot(attrs, prot) __pgprot(0)
-#define __alloc_remap_buffer(dev, size, gfp, prot, ret, c, wv) NULL
-#define __alloc_from_pool(size, ret_page) NULL
-#define __alloc_from_contiguous(dev, size, prot, ret, c, wv, coherent_flag) NULL
-#define __free_from_pool(cpu_addr, size) do { } while (0)
-#define __free_from_contiguous(dev, page, cpu_addr, size, wv) do { } while (0)
-#define __dma_free_remap(cpu_addr, size) do { } while (0)
-
-#endif /* CONFIG_MMU */
-
static void *__alloc_simple_buffer(struct device *dev, size_t size, gfp_t gfp,
struct page **ret_page)
{
@@ -803,7 +785,7 @@ static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,

if (cma)
buf->allocator = &cma_allocator;
- else if (nommu() || is_coherent)
+ else if (is_coherent)
buf->allocator = &simple_allocator;
else if (allowblock)
buf->allocator = &remap_allocator;
@@ -852,8 +834,7 @@ static int __arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
- int ret = -ENXIO;
-#ifdef CONFIG_MMU
+ int ret;
unsigned long nr_vma_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
unsigned long pfn = dma_to_pfn(dev, dma_addr);
@@ -868,7 +849,6 @@ static int __arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
vma->vm_end - vma->vm_start,
vma->vm_page_prot);
}
-#endif /* CONFIG_MMU */

return ret;
}
@@ -887,9 +867,7 @@ int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
-#ifdef CONFIG_MMU
vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot);
-#endif /* CONFIG_MMU */
return __arm_dma_mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
}

--
2.0.0