Make consistent_sync_page() highmem safe

Hi,

consistent_sync_page() is currently not highmem safe on non coherent platforms. PPC44x, for example, allows very large system memory (2GB). The following patch addresses this by kmap/kunmapping each segment of the buffer before calling consistent_sync(). It is interrupt safe since the streaming DMA API callers can be called from an interrupt context.

The code is only used on non-coherent systems and only if highmem support is enabled.

Comments?

-Matt

===== include/asm-ppc/kmap_types.h 1.14 vs edited =====

@@ -16,6 +16,7 @@
 	KM_IRQ1,
 	KM_SOFTIRQ0,
 	KM_SOFTIRQ1,
+	KM_PPC_SYNC_PAGE,
 	KM_TYPE_NR
 };
 

===== arch/ppc/mm/cachemap.c 1.15 vs edited =====

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