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Subject[PATCH 3/5] use new pagetable helpers in try_preserve_large_page()
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try_preserve_large_page() can be slightly simplified by using
the new page_level_*() helpers. This also moves the 'level'
over to the new pg_level enum type.

Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
---

linux-2.6.git-dave/arch/x86/mm/pageattr.c | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)

diff -puN arch/x86/mm/pageattr.c~use-new-pagetable-helpers arch/x86/mm/pageattr.c
--- linux-2.6.git/arch/x86/mm/pageattr.c~use-new-pagetable-helpers 2013-01-22 13:17:15.792312210 -0800
+++ linux-2.6.git-dave/arch/x86/mm/pageattr.c 2013-01-22 13:17:15.796312243 -0800
@@ -396,7 +396,7 @@ try_preserve_large_page(pte_t *kpte, uns
pte_t new_pte, old_pte, *tmp;
pgprot_t old_prot, new_prot, req_prot;
int i, do_split = 1;
- unsigned int level;
+ enum pg_level level;

if (cpa->force_split)
return 1;
@@ -412,15 +412,12 @@ try_preserve_large_page(pte_t *kpte, uns

switch (level) {
case PG_LEVEL_2M:
- psize = PMD_PAGE_SIZE;
- pmask = PMD_PAGE_MASK;
- break;
#ifdef CONFIG_X86_64
case PG_LEVEL_1G:
- psize = PUD_PAGE_SIZE;
- pmask = PUD_PAGE_MASK;
- break;
#endif
+ psize = page_level_size(level);
+ pmask = page_level_mask(level);
+ break;
default:
do_split = -EINVAL;
goto out_unlock;
_


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