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about r4k_dma_cache_inv and r4k_dma_cache_wback_inv in c-r4k.c

To: linux-mips <linux-mips@linux-mips.org>
Subject: about r4k_dma_cache_inv and r4k_dma_cache_wback_inv in c-r4k.c
From: zhuzhenhua <zzh.hust@gmail.com>
Date: Thu, 23 Nov 2006 08:53:19 +0800
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i see they all call                     
flush_dcache_line(a);   /* Hit_Writeback_Inv_D */

why didn't the r4k_dma_cache_inv call
invalidate_dcache_line(unsigned long addr)        /* Hit_Invalidate_D */;


Best Regards
zhuzhenhua

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