powerpc/mm: Move hash specific pte bits to be top bits of RPN

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We don't support the full 57 bits of physical address and hence can
overload the top bits of RPN as hash specific pte bits.

Add a BUILD_BUG_ON() to enforce the relationship between H_PAGE_F_SECOND
and H_PAGE_F_GIX.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: Paul Mackerras <paulus@ozlabs.org>
[mpe: Move the BUILD_BUG_ON() into hash_utils_64.c and comment it]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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This commit is contained in:

Aneesh Kumar K.V 2017-03-28 15:21:12 +11:00 • committed by Michael Ellerman

parent 2f18d53375

commit 6aa59f5162

3 changed files with 31 additions and 15 deletions

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17

arch/powerpc/include/asm/book3s/64/hash.h

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16

arch/powerpc/include/asm/book3s/64/pgtable.h

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13

arch/powerpc/mm/hash_utils_64.c

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