powerpc/mm: Implement _PAGE_SPECIAL & pte_special() for 64-bit
Implement _PAGE_SPECIAL and pte_special() for 64-bit powerpc. This bit will be used by the fast get_user_pages() to differenciate PTEs that correspond to a valid struct page from special mappings that don't such as IO mappings obtained via io_remap_pfn_ranges(). Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Hugh Dickins <hugh@veritas.com> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Reviewed-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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@ -46,6 +46,8 @@
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#define _PAGE_GROUP_IX 0x7000 /* software: HPTE index within group */
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#define _PAGE_F_SECOND _PAGE_SECONDARY
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#define _PAGE_F_GIX _PAGE_GROUP_IX
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#define _PAGE_SPECIAL 0x10000 /* software: special page */
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#define __HAVE_ARCH_PTE_SPECIAL
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/* PTE flags to conserve for HPTE identification */
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#define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | \
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@ -70,6 +70,8 @@ static inline struct subpage_prot_table *pgd_subpage_prot(pgd_t *pgd)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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/* Additional PTE bits (don't change without checking asm in hash_low.S) */
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#define __HAVE_ARCH_PTE_SPECIAL
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#define _PAGE_SPECIAL 0x00000400 /* software: special page */
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#define _PAGE_HPTE_SUB 0x0ffff000 /* combo only: sub pages HPTE bits */
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#define _PAGE_HPTE_SUB0 0x08000000 /* combo only: first sub page */
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#define _PAGE_COMBO 0x10000000 /* this is a combo 4k page */
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@ -245,7 +245,7 @@ static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW;}
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static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY;}
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static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED;}
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static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE;}
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static inline int pte_special(pte_t pte) { return 0; }
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static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
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static inline void pte_uncache(pte_t pte) { pte_val(pte) |= _PAGE_NO_CACHE; }
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static inline void pte_cache(pte_t pte) { pte_val(pte) &= ~_PAGE_NO_CACHE; }
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@ -265,7 +265,7 @@ static inline pte_t pte_mkyoung(pte_t pte) {
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static inline pte_t pte_mkhuge(pte_t pte) {
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return pte; }
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static inline pte_t pte_mkspecial(pte_t pte) {
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return pte; }
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pte_val(pte) |= _PAGE_SPECIAL; return pte; }
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static inline unsigned long pte_pgprot(pte_t pte)
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{
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return __pgprot(pte_val(pte)) & PAGE_PROT_BITS;
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