diff options
Diffstat (limited to 'arch/x86/include/asm/pgtable.h')
-rw-r--r-- | arch/x86/include/asm/pgtable.h | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 06bbcbd66e9c..4f5af8447d54 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h | |||
@@ -302,16 +302,30 @@ static inline pte_t pte_mkspecial(pte_t pte) | |||
302 | 302 | ||
303 | extern pteval_t __supported_pte_mask; | 303 | extern pteval_t __supported_pte_mask; |
304 | 304 | ||
305 | /* | ||
306 | * Mask out unsupported bits in a present pgprot. Non-present pgprots | ||
307 | * can use those bits for other purposes, so leave them be. | ||
308 | */ | ||
309 | static inline pgprotval_t massage_pgprot(pgprot_t pgprot) | ||
310 | { | ||
311 | pgprotval_t protval = pgprot_val(pgprot); | ||
312 | |||
313 | if (protval & _PAGE_PRESENT) | ||
314 | protval &= __supported_pte_mask; | ||
315 | |||
316 | return protval; | ||
317 | } | ||
318 | |||
305 | static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) | 319 | static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) |
306 | { | 320 | { |
307 | return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) | | 321 | return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) | |
308 | pgprot_val(pgprot)) & __supported_pte_mask); | 322 | massage_pgprot(pgprot)); |
309 | } | 323 | } |
310 | 324 | ||
311 | static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot) | 325 | static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot) |
312 | { | 326 | { |
313 | return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) | | 327 | return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) | |
314 | pgprot_val(pgprot)) & __supported_pte_mask); | 328 | massage_pgprot(pgprot)); |
315 | } | 329 | } |
316 | 330 | ||
317 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | 331 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
@@ -323,7 +337,7 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |||
323 | * the newprot (if present): | 337 | * the newprot (if present): |
324 | */ | 338 | */ |
325 | val &= _PAGE_CHG_MASK; | 339 | val &= _PAGE_CHG_MASK; |
326 | val |= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask; | 340 | val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK; |
327 | 341 | ||
328 | return __pte(val); | 342 | return __pte(val); |
329 | } | 343 | } |
@@ -339,7 +353,7 @@ static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) | |||
339 | 353 | ||
340 | #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK) | 354 | #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK) |
341 | 355 | ||
342 | #define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask) | 356 | #define canon_pgprot(p) __pgprot(massage_pgprot(p)) |
343 | 357 | ||
344 | static inline int is_new_memtype_allowed(unsigned long flags, | 358 | static inline int is_new_memtype_allowed(unsigned long flags, |
345 | unsigned long new_flags) | 359 | unsigned long new_flags) |