• Christoph Hellwig's avatar
    powerpc: use mm zones more sensibly · 25078dc1
    Christoph Hellwig authored
    Powerpc has somewhat odd usage where ZONE_DMA is used for all memory on
    common 64-bit configfs, and ZONE_DMA32 is used for 31-bit schemes.
    
    Move to a scheme closer to what other architectures use (and I dare to
    say the intent of the system):
    
     - ZONE_DMA: optionally for memory < 31-bit (64-bit embedded only)
     - ZONE_NORMAL: everything addressable by the kernel
     - ZONE_HIGHMEM: memory > 32-bit for 32-bit kernels
    
    Also provide information on how ZONE_DMA is used by defining
    ARCH_ZONE_DMA_BITS.
    
    Contains various fixes from Benjamin Herrenschmidt.
    Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    25078dc1
pgtable.h 3.61 KB