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    SubjectRe: [RFC][PATCH 34/35] powerpc use generic ptemap.h
    On Fri, May 01, 2009 at 07:42:54AM -0700, Dave Hansen wrote:
    >
    > powerpc is a bid of an oddball here. It seems to have CONFIG_HIGHPTE
    > behavior at all times when compiled as 32-bit. There's even an
    > #ifdef CONFIG_HIGHPTE in arch/powerpc/mm/pgtable_32.c, but there's no
    > trace of HIGHPTE in Kconfig anywhere.
    >
    > This gives ppc32 an explicit HIGHPTE in Kconfig so that we can use
    > the #ifdef in asm-generic/ptemap.h and let ppc use the generic code
    > with x86 and frv.

    But if you enabled HIGHPTE you need to remove that ifdef in pgtable_32.c
    because it didn't get triggered before.

    > #define _POWERPC_ASM_PTEMAP_H
    >
    > #ifndef __powerpc64__
    > +/*
    > + * This lets us use the x86 implementation
    > + * in the generic ptemap.h
    > + */
    > +#define kmap_atomic_pte(page, type) kmap_atomic(page, type)
    > +#endif

    That comment doesn't make any sense to me, x86 should have nothing to do
    with it. Also the comment would comfortably fit into a single line
    instead of two.



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