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    SubjectRe: Big Fix for 2.2.1

    On Wed, 27 Jan 1999, Linus Torvalds wrote:
    > On Wed, 27 Jan 1999, MOLNAR Ingo wrote:
    > >
    > > the attached patch works for me, but i guess it's definitely too ugly to
    > > live in the stock kernel. Anyway, if anyone wants to have non-power-2
    > > -PAGE_OFFSET, this patch might help...
    > It's definitely too ugly.
    > What you can do, is just something silly like this at bootup:
    > global void * isa_legacy_region;
    > pci_setup() or whatever {
    > isa_legacy_region = ioremap(0xA0000, 0x60000);
    > }
    > and then change everybody who uses "readX/writeX" to legacy addresses to
    > do read_ISA_X/write_ISA_X and then have something like
    > static inline unsigned char read_ISA_b(unsigned int legacy_address)
    > {
    > return readb(legacy_address+isa_legacy_region);
    > }

    Please don't do that. The Cyclades driver supports both ISA and PCI cards,
    and it follows correctly the current definition, by ioremap'ing addresses
    above 1MB and using readX/writeX for _all_ accesses to MMIO resources (in
    ISA or PCI). Doing this change would mean having to test which card I'm
    accessing _every time_ I do a readX/writeX, which is completelly
    unacceptable (for obvious performance reasons).

    Ivan Passos

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