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Index: linux-3.18-rc4/arch/arm/include/asm/glue-cache.h
===================================================================
--- linux-3.18-rc4.orig/arch/arm/include/asm/glue-cache.h
+++ linux-3.18-rc4/arch/arm/include/asm/glue-cache.h
@@ -156,11 +156,19 @@ static inline void nop_dma_unmap_area(co
#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 dmac_map_area __glue(_CACHE,_dma_map_area)
#define dmac_unmap_area __glue(_CACHE,_dma_unmap_area)
#define dmac_flush_range __glue(_CACHE,_dma_flush_range)
+#else
+#define __cpuc_flush_dcache_area __glue(fiq,_flush_kern_dcache_area)
+
+#define dmac_map_area __glue(fiq,_dma_map_area)
+#define dmac_unmap_area __glue(fiq,_dma_unmap_area)
+#define dmac_flush_range __glue(fiq,_dma_flush_range)
+#endif /* CONFIG_DMA_CACHE_FIQ_BROADCAST */
#endif
#endif
Index: linux-3.18-rc4/arch/arm/mm/Kconfig
===================================================================
--- linux-3.18-rc4.orig/arch/arm/mm/Kconfig
+++ linux-3.18-rc4/arch/arm/mm/Kconfig
@@ -843,6 +843,17 @@ config DMA_CACHE_RWFO
in hardware, other workarounds are needed (e.g. cache
maintenance broadcasting in software via FIQ).
+config DMA_CACHE_FIQ_BROADCAST
+ bool "Enable fiq broadcast DMA cache maintenance"
+ depends on CPU_V6K && SMP
+ select FIQ
+ help
+ The Snoop Control Unit on ARM11MPCore does not detect the
+ cache maintenance operations and the dma_{map,unmap}_area()
+ functions may leave stale cache entries on other CPUs. By
+ enabling this option, fiq broadcast in the ARMv6
+ DMA cache maintenance functions is performed.
+
config OUTER_CACHE
bool
Index: linux-3.18-rc4/arch/arm/mm/flush.c
===================================================================
--- linux-3.18-rc4.orig/arch/arm/mm/flush.c
+++ linux-3.18-rc4/arch/arm/mm/flush.c
@@ -314,7 +314,11 @@ void flush_dcache_page(struct page *page
mapping = page_mapping(page);
+#ifndef CONFIG_DMA_CACHE_FIQ_BROADCAST
if (!cache_ops_need_broadcast() &&
+#else
+ if (
+#endif
mapping && !page_mapped(page))
clear_bit(PG_dcache_clean, &page->flags);
else {
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