oxnas: sync 010-arm_introduce-dma-fiq-irq-broadcast with cns3xxx

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

target/linux/oxnas/patches-4.4/010-arm_introduce-dma-fiq-irq-broadcast.patch

@@ -4,15 +4,17 @@
  #define __cpuc_flush_user_range		__glue(_CACHE,_flush_user_cache_range)
  #define __cpuc_coherent_kern_range	__glue(_CACHE,_coherent_kern_range)
  #define __cpuc_coherent_user_range	__glue(_CACHE,_coherent_user_range)
-+#ifndef CONFIG_DMA_CACHE_FIQ_BROADCAST
- #define __cpuc_flush_dcache_area	__glue(_CACHE,_flush_kern_dcache_area)
+-#define __cpuc_flush_dcache_area	__glue(_CACHE,_flush_kern_dcache_area)
  
- #define dmac_flush_range		__glue(_CACHE,_dma_flush_range)
+-#define dmac_flush_range		__glue(_CACHE,_dma_flush_range)
++#ifndef CONFIG_DMA_CACHE_FIQ_BROADCAST
++# define __cpuc_flush_dcache_area	__glue(_CACHE,_flush_kern_dcache_area)
++# define dmac_flush_range		__glue(_CACHE,_dma_flush_range)
 +#else
-+#define __cpuc_flush_dcache_area	__glue(fiq,_flush_kern_dcache_area)
++# define __cpuc_flush_dcache_area	__glue(fiq,_flush_kern_dcache_area)
++# define dmac_flush_range		__glue(fiq,_dma_flush_range)
++#endif
 +
-+#define dmac_flush_range		__glue(fiq,_dma_flush_range)
-+#endif /* CONFIG_DMA_CACHE_FIQ_BROADCAST */
  #endif
  
  #endif
@@ -38,15 +40,23 @@
  
 --- a/arch/arm/mm/flush.c
 +++ b/arch/arm/mm/flush.c
-@@ -329,7 +329,11 @@ void flush_dcache_page(struct page *page
+@@ -319,6 +319,7 @@ void __sync_icache_dcache(pte_t pteval)
+ void flush_dcache_page(struct page *page)
+ {
+ 	struct address_space *mapping;
++	bool skip_broadcast = true;
+ 
+ 	/*
+ 	 * The zero page is never written to, so never has any dirty
+@@ -329,7 +330,10 @@ void flush_dcache_page(struct page *page
  
  	mapping = page_mapping(page);
  
+-	if (!cache_ops_need_broadcast() &&
 +#ifndef CONFIG_DMA_CACHE_FIQ_BROADCAST
- 	if (!cache_ops_need_broadcast() &&
-+#else
-+	if (
++	skip_broadcast = !cache_ops_need_broadcast();
 +#endif
++	if (skip_broadcast &&
  	    mapping && !page_mapped(page))
  		clear_bit(PG_dcache_clean, &page->flags);
  	else {
@@ -56,13 +66,15 @@
  #include <asm/glue-cache.h>
  
  #ifndef MULTI_CACHE
+-#define dmac_map_area			__glue(_CACHE,_dma_map_area)
+-#define dmac_unmap_area 		__glue(_CACHE,_dma_unmap_area)
 +#ifndef CONFIG_DMA_CACHE_FIQ_BROADCAST
- #define dmac_map_area			__glue(_CACHE,_dma_map_area)
- #define dmac_unmap_area 		__glue(_CACHE,_dma_unmap_area)
++# define dmac_map_area			__glue(_CACHE,_dma_map_area)
++# define dmac_unmap_area 		__glue(_CACHE,_dma_unmap_area)
 +#else
-+#define dmac_map_area			__glue(fiq,_dma_map_area)
-+#define dmac_unmap_area			__glue(fiq,_dma_unmap_area)
-+#endif /* CONFIG_DMA_CACHE_FIQ_BROADCAST */
++# define dmac_map_area			__glue(fiq,_dma_map_area)
++# define dmac_unmap_area			__glue(fiq,_dma_unmap_area)
++#endif
  
  /*
   * These are private to the dma-mapping API.  Do not use directly.