Messages in this thread | | | Date | Wed, 13 Oct 2010 11:01:06 -0700 | Subject | Re: [PATCH v3 2/2] MIPS: HIGHMEM DMA on noncoherent MIPS32 processors | From | Kevin Cernekee <> |
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On Wed, Oct 13, 2010 at 12:53 AM, Ralf Baechle <ralf@linux-mips.org> wrote: > It's this disabling of interrupts which I don't like. It's easy to get > around it by having one kmap type for each of process, softirq and > interrupt context.
I am curious as to why ARM opted for the "pte push/pop" strategy (kmap_high_l1_vipt()) instead of something along these lines?
Is there a reason why using 3 kmap types to solve the "interrupted flush problem" would work for MIPS, but is not a good solution on ARM?
> The good news is that Peter Zijlstra has rewritten kmap to make the need > for manually allocated kmap types go away and his patches are queued to > be merged for 2.6.37. So I'd like to put this patch on hold until after > his patches are merged.
OK, I'll take a look at that. Thanks for the pointer.
> Does your system have both highmem and cache aliases?
This system has HIGHMEM + SMP, no cache aliases. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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