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SubjectPowerPC exec page protection
<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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