PowerPC exec page protection

[Jamie Lokier]

<asm-ppc/pgtable.h> and <asm-ppc64/pgtable.h> both define the
following map of protection bits:

    #define __P000  PAGE_NONE
    #define __P001  PAGE_READONLY_X
    #define __P010  PAGE_COPY
    #define __P011  PAGE_COPY_X
    #define __P100  PAGE_READONLY
    #define __P101  PAGE_READONLY_X
    #define __P110  PAGE_COPY
    #define __P111  PAGE_COPY_X

    #define __S000  PAGE_NONE
    #define __S001  PAGE_READONLY_X
    #define __S010  PAGE_SHARED
    #define __S011  PAGE_SHARED_X
    #define __S100  PAGE_READONLY
    #define __S101  PAGE_READONLY_X
    #define __S110  PAGE_SHARED
    #define __S111  PAGE_SHARED_X

The _X flags seem wrongly placed, as bit 2 is the PROT_EXEC bit, not
bit 0.  Is the above intentional?

-- Jamie
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