dma_cache_maint_contiguous should be patched asdma_cache_maint do

[mkl lin]

>> Good point, that's actually a quick modification (2-3 lines in each
>> cache function). Mac Lin, can you try the patch below (without the other
>> broadcasting patch)? If it works, I'll add some comment:
> I have tested with my patch, and it seems good. No data integrity issue, nor any deadlock.
BTW, read performance drops from 64MBps to 44MBps on my platform.

Best Regards,
Mac Lin
 		 	   		  
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