ARM: dma-mapping: remove unconditional dependency on CMA

CMA has been enabled unconditionally on all ARMv6+ systems to solve the
long standing issue of double kernel mappings for all dma coherent
buffers. This however created a dependency on CONFIG_EXPERIMENTAL for
the whole ARM architecture what should be really avoided. This patch
removes this dependency and lets one use old, well-tested dma-mapping
implementation also on ARMv6+ systems without the need to use
EXPERIMENTAL stuff.

Reported-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

2 files changed, 4 insertions, 7 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b649c5904a4f..84449dd8f031 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -7,7 +7,6 @@ config ARM
         select HAVE_IDE if PCI || ISA || PCMCIA
         select HAVE_DMA_ATTRS
         select HAVE_DMA_CONTIGUOUS if (CPU_V6 || CPU_V6K || CPU_V7)
-        select CMA if (CPU_V6 || CPU_V6K || CPU_V7)
         select HAVE_MEMBLOCK
         select RTC_LIB
         select SYS_SUPPORTS_APM_EMULATION
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index ea6b43154090..106c4c0ebccd 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -268,10 +268,8 @@ static int __init consistent_init(void)
         unsigned long base = consistent_base;
         unsigned long num_ptes = (CONSISTENT_END - base) >> PMD_SHIFT;
 
-#ifndef CONFIG_ARM_DMA_USE_IOMMU
-        if (cpu_architecture() >= CPU_ARCH_ARMv6)
+        if (IS_ENABLED(CONFIG_CMA) && !IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU))
                 return 0;
-#endif
 
         consistent_pte = kmalloc(num_ptes * sizeof(pte_t), GFP_KERNEL);
         if (!consistent_pte) {
@@ -342,7 +340,7 @@ static int __init coherent_init(void)
         struct page *page;
         void *ptr;
 
-        if (cpu_architecture() < CPU_ARCH_ARMv6)
+        if (!IS_ENABLED(CONFIG_CMA))
                 return 0;
 
         ptr = __alloc_from_contiguous(NULL, size, prot, &page);
@@ -704,7 +702,7 @@ static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
 
         if (arch_is_coherent() || nommu())
                 addr = __alloc_simple_buffer(dev, size, gfp, &page);
-        else if (cpu_architecture() < CPU_ARCH_ARMv6)
+        else if (!IS_ENABLED(CONFIG_CMA))
                 addr = __alloc_remap_buffer(dev, size, gfp, prot, &page, caller);
         else if (gfp & GFP_ATOMIC)
                 addr = __alloc_from_pool(dev, size, &page, caller);
@@ -773,7 +771,7 @@ void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
 
         if (arch_is_coherent() || nommu()) {
                 __dma_free_buffer(page, size);
-        } else if (cpu_architecture() < CPU_ARCH_ARMv6) {
+        } else if (!IS_ENABLED(CONFIG_CMA)) {
                 __dma_free_remap(cpu_addr, size);
                 __dma_free_buffer(page, size);
         } else {