From: Kumar Gala Date: Sat, 16 Apr 2005 22:24:21 +0000 (-0700) Subject: [PATCH] ppc32: Allow adjust of pfn offset in pte X-Git-Tag: v2.6.12-rc3~211 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b464fce5edc08a825907e9d48a2d2f1af0393fef;p=linux-2.6 [PATCH] ppc32: Allow adjust of pfn offset in pte Allow the pfn to be offset by more than just PAGE_SHIFT in the pte. Today, PAGE_SHIFT tends to allow us to have 12-bits of flags in the pte. In the future if we have a larger pte we can allocate more bits for flags by offsetting the pfn even further. Signed-off-by: Kumar Gala Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/include/asm-ppc/pgtable.h b/include/asm-ppc/pgtable.h index 2e88cd9fef..e135b4aba9 100644 --- a/include/asm-ppc/pgtable.h +++ b/include/asm-ppc/pgtable.h @@ -431,10 +431,15 @@ extern unsigned long bad_call_to_PMD_PAGE_SIZE(void); * Conversions between PTE values and page frame numbers. */ -#define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT) +/* in some case we want to additionaly adjust where the pfn is in the pte to + * allow room for more flags */ +#define PFN_SHIFT_OFFSET (PAGE_SHIFT) + +#define pte_pfn(x) (pte_val(x) >> PFN_SHIFT_OFFSET) #define pte_page(x) pfn_to_page(pte_pfn(x)) -#define pfn_pte(pfn, prot) __pte(((pte_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) +#define pfn_pte(pfn, prot) __pte(((pte_basic_t)(pfn) << PFN_SHIFT_OFFSET) |\ + pgprot_val(prot)) #define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot) /*