On Mon, May 3, 2010 at 4:40 PM, Dezhong Diao (dediao) <dediao@xxxxxxxxx> wrote:
> + addr = (unsigned long)kmap_high_get(page);
> + if (addr) {
> + addr += offset;
> + __dma_sync_virtual(addr, size, direction);
> + kunmap_high(page);
> + }
When addr == 0, no flush is performed and that results in serious
coherency problems on my system.
The latest ARM code has a special "VIPT" handler for this case; I
suspect that MIPS needs something similar:
http://lists.infradead.org/pipermail/linux-arm-kernel/2010-March/012169.html
My cache is VIPT with no aliases.
