diff options
| author | Paul Mackerras <paulus@samba.org> | 2016-02-22 13:41:12 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-02-27 21:06:57 +1100 |
| commit | 1ec3f937102154b54c3ba97b79d4bd3931bb0eaa (patch) | |
| tree | fe1d48d2cac53135d9ffc8fd77f8c073ac7c070a /arch/powerpc/include/asm/book3s/64/hash.h | |
| parent | 2527083cb831024d22a03f68f54f6a46ecf5bf6c (diff) | |
powerpc/mm/book3s-64: Clean up some obsolete or misleading comments
No code changes.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/book3s/64/hash.h')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/hash.h | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h index 8d1c8162f0c1..9a0a4ef53b6d 100644 --- a/arch/powerpc/include/asm/book3s/64/hash.h +++ b/arch/powerpc/include/asm/book3s/64/hash.h @@ -4,8 +4,7 @@ /* * Common bits between 4K and 64K pages in a linux-style PTE. - * These match the bits in the (hardware-defined) PowerPC PTE as closely - * as possible. Additional bits may be defined in pgtable-hash64-*.h + * Additional bits may be defined in pgtable-hash64-*.h * * Note: We only support user read/write permissions. Supervisor always * have full read/write to pages above PAGE_OFFSET (pages below that @@ -14,13 +13,13 @@ * We could create separate kernel read-only if we used the 3 PP bits * combinations that newer processors provide but we currently don't. */ -#define _PAGE_PTE 0x00001 +#define _PAGE_PTE 0x00001 /* distinguishes PTEs from pointers */ #define _PAGE_PRESENT 0x00002 /* software: pte contains a translation */ #define _PAGE_BIT_SWAP_TYPE 2 -#define _PAGE_USER 0x00004 /* matches one of the PP bits */ -#define _PAGE_EXEC 0x00008 /* No execute on POWER4 and newer (we invert) */ -#define _PAGE_GUARDED 0x00010 -/* We can derive Memory coherence from _PAGE_NO_CACHE */ +#define _PAGE_USER 0x00004 /* page may be accessed by userspace */ +#define _PAGE_EXEC 0x00008 /* execute permission */ +#define _PAGE_GUARDED 0x00010 /* G: guarded (side-effect) page */ +/* M (memory coherence) is always set in the HPTE, so we don't need it here */ #define _PAGE_COHERENT 0x0 #define _PAGE_NO_CACHE 0x00020 /* I: cache inhibit */ #define _PAGE_WRITETHRU 0x00040 /* W: cache write-through */ |