On Fri, Jun 07, 2013 at 11:38:54AM +0200, Alessandro Rubini wrote: > Hello. > This is cc'd to $(get_maintainer.pl -f drivers/tty/serial/amba-pl011.c) > and x86 maintainers too. > > While working on the pci-to-amba bridge driver (to be resubmitted in > the next days) I have to deal with the problem of pl011 not building, > after phys_to_page was introduced, by Chanho Min (Cc: here) in commit > > cb06ff1 ARM: PL011: Add support for Rx DMA buffer polling. > > because x86 has no phys_to_page. > > The fix I use is trivially this: > > - sg_set_page(&sg->sg, phys_to_page(dma_addr), > + sg_set_page(&sg->sg, virt_to_page(sg->buf), > > (virt_to_page is slower, but other sg_get_page() users do the same > and other solutions are more convoluted).
... and thereby breaks ARM, because sg->buf is not part of the kernel direct mapped RAM region. I don't think there's a portable way to do the above, because the DMA coherent API doesn't really support translating the allocated memory region to a struct page pointer. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
