On Thu, Nov 29, 2018 at 8:23 AM Christoph Hellwig wrote:
>
> We can. At least in theory. The problem is that depending on the
> crazy mapping from physical and kernel virtual address to dma addresses
> these might be pages at pretty random places. Look at fun like
> arch/x86/pci/sta2x11-fixup.c
On 22/11/2018 17:09, Linus Torvalds wrote:
On Thu, Nov 22, 2018 at 9:07 AM Russell King - ARM Linux
wrote:
I'm afraid that won't work very well - 32 bit platforms with 64-bit
addresses (LPAE) would have dma_addr_t as a 64-bit value, which
wouldn't fit into an unsigned long.
Good point. So we
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