x86, mm: Pagetable level size/shift/mask helpers

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I plan to use lookup_address() to walk the kernel pagetables
in a later patch.  It returns a "pte" and the level in the
pagetables where the "pte" was found.  The level is just an
enum and needs to be converted to a useful value in order to
do address calculations with it.  These helpers will be used
in at least two places.

This also gives the anonymous enum a real name so that no one
gets confused about what they should be passing in to these
helpers.

"PTE_SHIFT" was chosen for naming consistency with the other
pagetable levels (PGD/PUD/PMD_SHIFT).

Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20130122212431.405D3A8C@kernel.stglabs.ibm.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

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Dave Hansen 2013-01-22 13:24:31 -08:00 • committed by H. Peter Anvin

parent a25b931684

commit 4cbeb51b86

2 changed files with 15 additions and 1 deletions

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14

arch/x86/include/asm/pgtable.h

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2

arch/x86/include/asm/pgtable_types.h

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