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    SubjectRe: highmem pci dma mapping does not work, missing cast in asm-i386/pci.h
    >>>>> "Ben" == Benjamin LaHaise <> writes:

    Ben> Hello all, There's a missing cast in pci_map_page that causes 64
    Ben> bit capable drivers to access the wrong memory for highmem pages.
    Ben> Please include the patch below to fix it.

    Looking at this one, I believe we need to do the same for
    page_to_phys() - either by using dma_addr_t as the type or explicitly
    going u64 #ifdef CONFIG_HIGHMEM.

    Patch using dma_addr_t included relative to 2.4.18.

    Btw. I noticed that in 2.5.24/ia32 we use CONFIG_HIGHMEM to declare
    dma_addr_t as 64 bit but CONFIG_HIGHMEM64G to handle page_to_phys. Is
    this just an oversight or on purpose?



    --- include/asm-i386/io.h~ Sun Jun 23 11:29:26 2002
    +++ include/asm-i386/io.h Sun Jun 23 11:30:17 2002
    @@ -2,6 +2,7 @@
    #define _ASM_IO_H

    #include <linux/config.h>
    +#include <asm/types.h>

    * This file contains the definitions for the x86 IO instructions
    @@ -76,7 +77,7 @@
    * Change "struct page" to physical address.
    -#define page_to_phys(page) ((page - mem_map) << PAGE_SHIFT)
    +#define page_to_phys(page) ((dma_addr_t)(page - mem_map) << PAGE_SHIFT)

    extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);

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