• Arnd Bergmann's avatar
    arch/*/: remove CONFIG_VIRT_TO_BUS · 4313a249
    Arnd Bergmann authored
    All architecture-independent users of virt_to_bus() and bus_to_virt()
    have been fixed to use the dma mapping interfaces or have been
    removed now.  This means the definitions on most architectures, and the
    CONFIG_VIRT_TO_BUS symbol are now obsolete and can be removed.
    
    The only exceptions to this are a few network and scsi drivers for m68k
    Amiga and VME machines and ppc32 Macintosh. These drivers work correctly
    with the old interfaces and are probably not worth changing.
    
    On alpha and parisc, virt_to_bus() were still used in asm/floppy.h.
    alpha can use isa_virt_to_bus() like x86 does, and parisc can just
    open-code the virt_to_phys() here, as this is architecture specific
    code.
    
    I tried updating the bus-virt-phys-mapping.rst documentation, which
    started as an email from Linus to explain some details of the Linux-2.0
    driver interfaces. The bits about virt_to_bus() were declared obsolete
    backin 2000, and the rest is not all that relevant any more, so in the
    end I just decided to remove the file completely.
    Reviewed-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
    Acked-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
    Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
    Acked-by: Helge Deller <deller@gmx.de> # parisc
    Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
    4313a249
Kconfig 94.3 KB