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    [POWERPC] Port fixmap from x86 and use for kmap_atomic · 2c419bde
    Kumar Gala 提交于
    The fixmap code from x86 allows us to have compile time virtual addresses
    that we change the physical addresses of at run time.
    
    This is useful for applications like kmap_atomic, PCI config that is done
    via direct memory map, kexec/kdump.
    
    We got ride of CONFIG_HIGHMEM_START as we can now determine a more optimal
    location for PKMAP_BASE based on where the fixmap addresses start and
    working back from there.
    
    Additionally, the kmap code in asm-powerpc/highmem.h always had debug
    enabled.  Moved to using CONFIG_DEBUG_HIGHMEM to determine if we should
    have the extra debug checking.
    Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
    Signed-off-by: NPaul Mackerras <paulus@samba.org>
    2c419bde
pgtable_32.c 9.4 KB