diff options
| -rw-r--r-- | include/asm-alpha/pgtable.h | 2 | ||||
| -rw-r--r-- | include/asm-arm/pgtable.h | 3 | ||||
| -rw-r--r-- | include/asm-avr32/pgtable.h | 8 | ||||
| -rw-r--r-- | include/asm-cris/pgtable.h | 2 | ||||
| -rw-r--r-- | include/asm-frv/pgtable.h | 2 | ||||
| -rw-r--r-- | include/asm-ia64/pgtable.h | 3 | ||||
| -rw-r--r-- | include/asm-m32r/pgtable.h | 10 | ||||
| -rw-r--r-- | include/asm-m68k/motorola_pgtable.h | 2 | ||||
| -rw-r--r-- | include/asm-m68k/sun3_pgtable.h | 2 | ||||
| -rw-r--r-- | include/asm-mips/pgtable.h | 2 | ||||
| -rw-r--r-- | include/asm-mn10300/pgtable.h | 3 | ||||
| -rw-r--r-- | include/asm-parisc/pgtable.h | 2 | ||||
| -rw-r--r-- | include/asm-powerpc/pgtable-ppc32.h | 3 | ||||
| -rw-r--r-- | include/asm-powerpc/pgtable-ppc64.h | 3 | ||||
| -rw-r--r-- | include/asm-ppc/pgtable.h | 3 | ||||
| -rw-r--r-- | include/asm-s390/pgtable.h | 10 | ||||
| -rw-r--r-- | include/asm-sh/pgtable_32.h | 3 | ||||
| -rw-r--r-- | include/asm-sh/pgtable_64.h | 10 | ||||
| -rw-r--r-- | include/asm-sparc/pgtable.h | 7 | ||||
| -rw-r--r-- | include/asm-sparc64/pgtable.h | 10 | ||||
| -rw-r--r-- | include/asm-um/pgtable.h | 10 | ||||
| -rw-r--r-- | include/asm-x86/pgtable.h | 10 | ||||
| -rw-r--r-- | include/asm-xtensa/pgtable.h | 4 | ||||
| -rw-r--r-- | include/linux/mm.h | 4 | ||||
| -rw-r--r-- | mm/memory.c | 99 |
25 files changed, 168 insertions, 49 deletions
diff --git a/include/asm-alpha/pgtable.h b/include/asm-alpha/pgtable.h index 99037b0..05ce5fb 100644 --- a/include/asm-alpha/pgtable.h +++ b/include/asm-alpha/pgtable.h @@ -268,6 +268,7 @@ extern inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_FOW); } extern inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } extern inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } extern inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } +extern inline int pte_special(pte_t pte) { return 0; } extern inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_FOW; return pte; } extern inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~(__DIRTY_BITS); return pte; } @@ -275,6 +276,7 @@ extern inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~(__ACCESS_BITS); ret extern inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_FOW; return pte; } extern inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= __DIRTY_BITS; return pte; } extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= __ACCESS_BITS; return pte; } +extern inline pte_t pte_mkspecial(pte_t pte) { return pte; } #define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address)) diff --git a/include/asm-arm/pgtable.h b/include/asm-arm/pgtable.h index 5e01824..5571c13 100644 --- a/include/asm-arm/pgtable.h +++ b/include/asm-arm/pgtable.h @@ -260,6 +260,7 @@ extern struct page *empty_zero_page; #define pte_write(pte) (pte_val(pte) & L_PTE_WRITE) #define pte_dirty(pte) (pte_val(pte) & L_PTE_DIRTY) #define pte_young(pte) (pte_val(pte) & L_PTE_YOUNG) +#define pte_special(pte) (0) /* * The following only works if pte_present() is not true. @@ -280,6 +281,8 @@ PTE_BIT_FUNC(mkdirty, |= L_PTE_DIRTY); PTE_BIT_FUNC(mkold, &= ~L_PTE_YOUNG); PTE_BIT_FUNC(mkyoung, |= L_PTE_YOUNG); +static inline pte_t pte_mkspecial(pte_t pte) { return pte; } + /* * Mark the prot value as uncacheable and unbufferable. */ diff --git a/include/asm-avr32/pgtable.h b/include/asm-avr32/pgtable.h index 3ae7b54..c0e5e29 100644 --- a/include/asm-avr32/pgtable.h +++ b/include/asm-avr32/pgtable.h @@ -212,6 +212,10 @@ static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } +static inline int pte_special(pte_t pte) +{ + return 0; +} /* * The following only work if pte_present() is not true. @@ -252,6 +256,10 @@ static inline pte_t pte_mkyoung(pte_t pte) set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; } +static inline pte_t pte_mkspecial(pte_t pte) +{ + return pte; +} #define pmd_none(x) (!pmd_val(x)) #define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT) diff --git a/include/asm-cris/pgtable.h b/include/asm-cris/pgtable.h index a260757..4c37362 100644 --- a/include/asm-cris/pgtable.h +++ b/include/asm-cris/pgtable.h @@ -115,6 +115,7 @@ static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WR static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; } static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } +static inline int pte_special(pte_t pte) { return 0; } static inline pte_t pte_wrprotect(pte_t pte) { @@ -162,6 +163,7 @@ static inline pte_t pte_mkyoung(pte_t pte) } return pte; } +static inline pte_t pte_mkspecial(pte_t pte) { return pte; } /* * Conversion functions: convert a page and protection to a page entry, diff --git a/include/asm-frv/pgtable.h b/include/asm-frv/pgtable.h index 4e21904..83c51aba 100644 --- a/include/asm-frv/pgtable.h +++ b/include/asm-frv/pgtable.h @@ -380,6 +380,7 @@ static inline pmd_t *pmd_offset(pud_t *dir, unsigned long address) static inline int pte_dirty(pte_t pte) { return (pte).pte & _PAGE_DIRTY; } static inline int pte_young(pte_t pte) { return (pte).pte & _PAGE_ACCESSED; } static inline int pte_write(pte_t pte) { return !((pte).pte & _PAGE_WP); } +static inline int pte_special(pte_t pte) { return 0; } static inline pte_t pte_mkclean(pte_t pte) { (pte).pte &= ~_PAGE_DIRTY; return pte; } static inline pte_t pte_mkold(pte_t pte) { (pte).pte &= ~_PAGE_ACCESSED; return pte; } @@ -387,6 +388,7 @@ static inline pte_t pte_wrprotect(pte_t pte) { (pte).pte |= _PAGE_WP; return pte static inline pte_t pte_mkdirty(pte_t pte) { (pte).pte |= _PAGE_DIRTY; return pte; } static inline pte_t pte_mkyoung(pte_t pte) { (pte).pte |= _PAGE_ACCESSED; return pte; } static inline pte_t pte_mkwrite(pte_t pte) { (pte).pte &= ~_PAGE_WP; return pte; } +static inline pte_t pte_mkspecial(pte_t pte) { return pte; } static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) { diff --git a/include/asm-ia64/pgtable.h b/include/asm-ia64/pgtable.h index ed70862..7a9bff4 100644 --- a/include/asm-ia64/pgtable.h +++ b/include/asm-ia64/pgtable.h @@ -302,6 +302,8 @@ ia64_phys_addr_valid (unsigned long addr) #define pte_dirty(pte) ((pte_val(pte) & _PAGE_D) != 0) #define pte_young(pte) ((pte_val(pte) & _PAGE_A) != 0) #define pte_file(pte) ((pte_val(pte) & _PAGE_FILE) != 0) +#define pte_special(pte) 0 + /* * Note: we convert AR_RWX to AR_RX and AR_RW to AR_R by clearing the 2nd bit in the * access rights: @@ -313,6 +315,7 @@ ia64_phys_addr_valid (unsigned long addr) #define pte_mkclean(pte) (__pte(pte_val(pte) & ~_PAGE_D)) #define pte_mkdirty(pte) (__pte(pte_val(pte) | _PAGE_D)) #define pte_mkhuge(pte) (__pte(pte_val(pte))) +#define pte_mkspecial(pte) (pte) /* * Because ia64's Icache and Dcache is not coherent (on a cpu), we need to diff --git a/include/asm-m32r/pgtable.h b/include/asm-m32r/pgtable.h index 8650538..e6359c5 100644 --- a/include/asm-m32r/pgtable.h +++ b/include/asm-m32r/pgtable.h @@ -214,6 +214,11 @@ static inline int pte_file(pte_t pte) return pte_val(pte) & _PAGE_FILE; } +static inline int pte_special(pte_t pte) +{ + return 0; +} + static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; @@ -250,6 +255,11 @@ static inline pte_t pte_mkwrite(pte_t pte) return pte; } +static inline pte_t pte_mkspecial(pte_t pte) +{ + return pte; +} + static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) { return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep); diff --git a/include/asm-m68k/motorola_pgtable.h b/include/asm-m68k/motorola_pgtable.h index 13135d4..8e9a8a7 100644 --- a/include/asm-m68k/motorola_pgtable.h +++ b/include/asm-m68k/motorola_pgtable.h @@ -168,6 +168,7 @@ static inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_RONLY); static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } +static inline int pte_special(pte_t pte) { return 0; } static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_RONLY; return pte; } static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; } @@ -185,6 +186,7 @@ static inline pte_t pte_mkcache(pte_t pte) pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode; return pte; } +static inline pte_t pte_mkspecial(pte_t pte) { return pte; } #define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address)) diff --git a/include/asm-m68k/sun3_pgtable.h b/include/asm-m68k/sun3_pgtable.h index b766fc2..f847ec7 100644 --- a/include/asm-m68k/sun3_pgtable.h +++ b/include/asm-m68k/sun3_pgtable.h @@ -169,6 +169,7 @@ static inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEA static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; } static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; } static inline int pte_file(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; } +static inline int pte_special(pte_t pte) { return 0; } static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; } static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; } @@ -181,6 +182,7 @@ static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE //static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; } // until then, use: static inline pte_t pte_mkcache(pte_t pte) { return pte; } +static inline pte_t pte_mkspecial(pte_t pte) { return pte; } extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; diff --git a/include/asm-mips/pgtable.h b/include/asm-mips/pgtable.h index 17a7703..782221e 100644 --- a/include/asm-mips/pgtable.h +++ b/include/asm-mips/pgtable.h @@ -285,6 +285,8 @@ static inline pte_t pte_mkyoung(pte_t pte) return pte; } #endif +static inline int pte_special(pte_t pte) { return 0; } +static inline pte_t pte_mkspecial(pte_t pte) { return pte; } /* * Macro to make mark a page protection value as "uncacheable". Note diff --git a/include/asm-mn10300/pgtable.h b/include/asm-mn10300/pgtable.h index 375c494..6dc30fc 100644 --- a/include/asm-mn10300/pgtable.h +++ b/include/asm-mn10300/pgtable.h @@ -224,6 +224,7 @@ static inline int pte_read(pte_t pte) { return pte_val(pte) & __PAGE_PROT_USER; static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } static inline int pte_write(pte_t pte) { return pte_val(pte) & __PAGE_PROT_WRITE; } +static inline int pte_special(pte_t pte){ return 0; } /* * The following only works if pte_present() is not true. @@ -265,6 +266,8 @@ static inline pte_t pte_mkwrite(pte_t pte) return pte; } +static inline pte_t pte_mkspecial(pte_t pte) { return pte; } + #define pte_ERROR(e) \ printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \ __FILE__, __LINE__, pte_val(e)) diff --git a/include/asm-parisc/pgtable.h b/include/asm-parisc/pgtable.h index dc86adb..470a4b8 100644 --- a/include/asm-parisc/pgtable.h +++ b/include/asm-parisc/pgtable.h @@ -323,6 +323,7 @@ static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } +static inline int pte_special(pte_t pte) { return 0; } static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; } static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } @@ -330,6 +331,7 @@ static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~_PAGE_WRITE; ret static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= _PAGE_WRITE; return pte; } +static inline pte_t pte_mkspecial(pte_t pte) { return pte; } /* * Conversion functions: convert a page and protection to a page entry, diff --git a/include/asm-powerpc/pgtable-ppc32.h b/include/asm-powerpc/pgtable-ppc32.h index daea769..7c97b5a 100644 --- a/include/asm-powerpc/pgtable-ppc32.h +++ b/include/asm-powerpc/pgtable-ppc32.h @@ -504,6 +504,7 @@ static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; } static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } +static inline int pte_special(pte_t pte) { return 0; } static inline void pte_uncache(pte_t pte) { pte_val(pte) |= _PAGE_NO_CACHE; } static inline void pte_cache(pte_t pte) { pte_val(pte) &= ~_PAGE_NO_CACHE; } @@ -521,6 +522,8 @@ static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } +static inline pte_t pte_mkspecial(pte_t pte) { + return pte; } static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { diff --git a/include/asm-powerpc/pgtable-ppc64.h b/include/asm-powerpc/pgtable-ppc64.h index dd4c26d..27f1869 100644 --- a/include/asm-powerpc/pgtable-ppc64.h +++ b/include/asm-powerpc/pgtable-ppc64.h @@ -239,6 +239,7 @@ static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW;} static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY;} static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED;} static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE;} +static inline int pte_special(pte_t pte) { return 0; } static inline void pte_uncache(pte_t pte) { pte_val(pte) |= _PAGE_NO_CACHE; } static inline void pte_cache(pte_t pte) { pte_val(pte) &= ~_PAGE_NO_CACHE; } @@ -257,6 +258,8 @@ static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } static inline pte_t pte_mkhuge(pte_t pte) { return pte; } +static inline pte_t pte_mkspecial(pte_t pte) { + return pte; } /* Atomic PTE updates */ static inline unsigned long pte_update(struct mm_struct *mm, diff --git a/include/asm-ppc/pgtable.h b/include/asm-ppc/pgtable.h index 70435d3..55f9d38 100644 --- a/include/asm-ppc/pgtable.h +++ b/include/asm-ppc/pgtable.h @@ -483,6 +483,7 @@ static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; } static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } +static inline int pte_special(pte_t pte) { return 0; } static inline void pte_uncache(pte_t pte) { pte_val(pte) |= _PAGE_NO_CACHE; } static inline void pte_cache(pte_t pte) { pte_val(pte) &= ~_PAGE_NO_CACHE; } @@ -500,6 +501,8 @@ static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } +static inline pte_t pte_mkspecial(pte_t pte) { + return pte; } static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h index 4c0698c..76e8a79 100644 --- a/include/asm-s390/pgtable.h +++ b/include/asm-s390/pgtable.h @@ -518,6 +518,11 @@ static inline int pte_file(pte_t pte) return (pte_val(pte) & mask) == _PAGE_TYPE_FILE; } +static inline int pte_special(pte_t pte) +{ + return 0; +} + #define __HAVE_ARCH_PTE_SAME #define pte_same(a,b) (pte_val(a) == pte_val(b)) @@ -715,6 +720,11 @@ static inline pte_t pte_mkyoung(pte_t pte) return pte; } +static inline pte_t pte_mkspecial(pte_t pte) +{ + return pte; +} + #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) diff --git a/include/asm-sh/pgtable_32.h b/include/asm-sh/pgtable_32.h index 3e3557c..cbc731d 100644 --- a/include/asm-sh/pgtable_32.h +++ b/include/asm-sh/pgtable_32.h @@ -326,6 +326,7 @@ static inline void set_pte(pte_t *ptep, pte_t pte) #define pte_dirty(pte) ((pte).pte_low & _PAGE_DIRTY) #define pte_young(pte) ((pte).pte_low & _PAGE_ACCESSED) #define pte_file(pte) ((pte).pte_low & _PAGE_FILE) +#define pte_special(pte) (0) #ifdef CONFIG_X2TLB #define pte_write(pte) ((pte).pte_high & _PAGE_EXT_USER_WRITE) @@ -356,6 +357,8 @@ PTE_BIT_FUNC(low, mkdirty, |= _PAGE_DIRTY); PTE_BIT_FUNC(low, mkold, &= ~_PAGE_ACCESSED); PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED); +static inline pte_t pte_mkspecial(pte_t pte) { return pte; } + /* * Macro and implementation to make a page protection as uncachable. */ diff --git a/include/asm-sh/pgtable_64.h b/include/asm-sh/pgtable_64.h index f9dd9d3..c78990c 100644 --- a/include/asm-sh/pgtable_64.h +++ b/include/asm-sh/pgtable_64.h @@ -254,10 +254,11 @@ extern void __handle_bad_pmd_kernel(pmd_t * pmd); /* * The following have defined behavior only work if pte_present() is true. */ -static inline int pte_dirty(pte_t pte){ return pte_val(pte) & _PAGE_DIRTY; } -static inline int pte_young(pte_t pte){ return pte_val(pte) & _PAGE_ACCESSED; } -static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } -static inline int pte_write(pte_t pte){ return pte_val(pte) & _PAGE_WRITE; } +static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } +static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } +static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } +static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } +static inline int pte_special(pte_t pte){ return 0; } static inline pte_t pte_wrprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_WRITE)); return pte; } static inline pte_t pte_mkclean(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; } @@ -266,6 +267,7 @@ static inline pte_t pte_mkwrite(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | static inline pte_t pte_mkdirty(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; } static inline pte_t pte_mkyoung(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; } static inline pte_t pte_mkhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_SZHUGE)); return pte; } +static inline pte_t pte_mkspecial(pte_t pte) { return pte; } /* diff --git a/include/asm-sparc/pgtable.h b/include/asm-sparc/pgtable.h index 2cc235b..d84af6d 100644 --- a/include/asm-sparc/pgtable.h +++ b/include/asm-sparc/pgtable.h @@ -219,6 +219,11 @@ static inline int pte_file(pte_t pte) return pte_val(pte) & BTFIXUP_HALF(pte_filei); } +static inline int pte_special(pte_t pte) +{ + return 0; +} + /* */ BTFIXUPDEF_HALF(pte_wrprotecti) @@ -251,6 +256,8 @@ BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t) #define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte) #define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte) +#define pte_mkspecial(pte) (pte) + #define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot) BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t) diff --git a/include/asm-sparc64/pgtable.h b/include/asm-sparc64/pgtable.h index 549e452..0e200e7 100644 --- a/include/asm-sparc64/pgtable.h +++ b/include/asm-sparc64/pgtable.h @@ -506,6 +506,11 @@ static inline pte_t pte_mkyoung(pte_t pte) return __pte(pte_val(pte) | mask); } +static inline pte_t pte_mkspecial(pte_t pte) +{ + return pte; +} + static inline unsigned long pte_young(pte_t pte) { unsigned long mask; @@ -608,6 +613,11 @@ static inline unsigned long pte_present(pte_t pte) return val; } +static inline int pte_special(pte_t pte) +{ + return 0; +} + #define pmd_set(pmdp, ptep) \ (pmd_val(*(pmdp)) = (__pa((unsigned long) (ptep)) >> 11UL)) #define pud_set(pudp, pmdp) \ diff --git a/include/asm-um/pgtable.h b/include/asm-um/pgtable.h index 4102b44..02db81b 100644 --- a/include/asm-um/pgtable.h +++ b/include/asm-um/pgtable.h @@ -173,6 +173,11 @@ static inline int pte_newprot(pte_t pte) return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT))); } +static inline int pte_special(pte_t pte) +{ + return 0; +} + /* * ================================= * Flags setting section. @@ -241,6 +246,11 @@ static inline pte_t pte_mknewpage(pte_t pte) return(pte); } +static inline pte_t pte_mkspecial(pte_t pte) +{ + return(pte); +} + static inline void set_pte(pte_t *pteptr, pte_t pteval) { pte_copy(*pteptr, pteval); diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h index a496d63..801b31f 100644 --- a/include/asm-x86/pgtable.h +++ b/include/asm-x86/pgtable.h @@ -195,6 +195,11 @@ static inline int pte_exec(pte_t pte) return !(pte_val(pte) & _PAGE_NX); } +static inline int pte_special(pte_t pte) +{ + return 0; +} + static inline int pmd_large(pmd_t pte) { return (pmd_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) == @@ -256,6 +261,11 @@ static inline pte_t pte_clrglobal(pte_t pte) return __pte(pte_val(pte) & ~(pteval_t)_PAGE_GLOBAL); } +static inline pte_t pte_mkspecial(pte_t pte) +{ + return pte; +} + extern pteval_t __supported_pte_mask; static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) diff --git a/include/asm-xtensa/pgtable.h b/include/asm-xtensa/pgtable.h index c8b024a..8014d96 100644 --- a/include/asm-xtensa/pgtable.h +++ b/include/asm-xtensa/pgtable.h @@ -210,6 +210,8 @@ static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITABLE; } static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } +static inline int pte_special(pte_t pte) { return 0; } + static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~(_PAGE_WRITABLE | _PAGE_HW_WRITE); return pte; } static inline pte_t pte_mkclean(pte_t pte) @@ -222,6 +224,8 @@ static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= _PAGE_WRITABLE; return pte; } +static inline pte_t pte_mkspecial(pte_t pte) + { return pte; } /* * Conversion functions: convert a page and protection to a page entry, diff --git a/include/linux/mm.h b/include/linux/mm.h index c657ea0..ba86dda 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -721,7 +721,9 @@ struct zap_details { unsigned long truncate_count; /* Compare vm_truncate_count */ }; -struct page *vm_normal_page(struct vm_area_struct *, unsigned long, pte_t); +struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, + pte_t pte); + unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address, unsigned long size, struct zap_details *); unsigned long unmap_vmas(struct mmu_gather **tlb, diff --git a/mm/memory.c b/mm/memory.c index 0da414c..c5e88bc 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -371,33 +371,37 @@ static inline int is_cow_mapping(unsigned int flags) } /* - * This function gets the "struct page" associated with a pte or returns - * NULL if no "struct page" is associated with the pte. + * vm_normal_page -- This function gets the "struct page" associated with a pte. * - * A raw VM_PFNMAP mapping (ie. one that is not COWed) may not have any "struct - * page" backing, and even if they do, they are not refcounted. COWed pages of - * a VM_PFNMAP do always have a struct page, and they are normally refcounted - * (they are _normal_ pages). + * "Special" mappings do not wish to be associated with a "struct page" (either + * it doesn't exist, or it exists but they don't want to touch it). In this + * case, NULL is returned here. "Normal" mappings do have a struct page. * - * So a raw PFNMAP mapping will have each page table entry just pointing - * to a page frame number, and as far as the VM layer is concerned, those do - * not have pages associated with them - even if the PFN might point to memory - * that otherwise is perfectly fine and has a "struct page". + * There are 2 broad cases. Firstly, an architecture may define a pte_special() + * pte bit, in which case this function is trivial. Secondly, an architecture + * may not have a spare pte bit, which requires a more complicated scheme, + * described below. + * + * A raw VM_PFNMAP mapping (ie. one that is not COWed) is always considered a + * special mapping (even if there are underlying and valid "struct pages"). + * COWed pages of a VM_PFNMAP are always normal. * * The way we recognize COWed pages within VM_PFNMAP mappings is through the * rules set up by "remap_pfn_range()": the vma will have the VM_PFNMAP bit - * set, and the vm_pgoff will point to the first PFN mapped: thus every - * page that is a raw mapping will always honor the rule + * set, and the vm_pgoff will point to the first PFN mapped: thus every special + * mapping will always honor the rule * * pfn_of_page == vma->vm_pgoff + ((addr - vma->vm_start) >> PAGE_SHIFT) * - * A call to vm_normal_page() will return NULL for such a page. + * And for normal mappings this is false. + * + * This restricts such mappings to be a linear translation from virtual address + * to pfn. To get around this restriction, we allow arbitrary mappings so long + * as the vma is not a COW mapping; in that case, we know that all ptes are + * special (because none can have been COWed). * - * If the page doesn't follow the "remap_pfn_range()" rule in a VM_PFNMAP - * then the page has been COW'ed. A COW'ed page _does_ have a "struct page" - * associated with it even if it is in a VM_PFNMAP range. Calling - * vm_normal_page() on such a page will therefore return the "struct page". * + * In order to support COW of arbitrary special mappings, we have VM_MIXEDMAP. * * VM_MIXEDMAP mappings can likewise contain memory with or without "struct * page" backing, however the difference is that _all_ pages with a struct @@ -407,16 +411,29 @@ static inline int is_cow_mapping(unsigned int flags) * advantage is that we don't have to follow the strict linearity rule of * PFNMAP mappings in order to support COWable mappings. * - * A call to vm_normal_page() with a VM_MIXEDMAP mapping will return the - * associated "struct page" or NULL for memory not backed by a "struct page". - * - * - * All other mappings should have a valid struct page, which will be - * returned by a call to vm_normal_page(). */ -struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, pte_t pte) +#ifdef __HAVE_ARCH_PTE_SPECIAL +# define HAVE_PTE_SPECIAL 1 +#else +# define HAVE_PTE_SPECIAL 0 +#endif +struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, + pte_t pte) { - unsigned long pfn = pte_pfn(pte); + unsigned long pfn; + + if (HAVE_PTE_SPECIAL) { + if (likely(!pte_special(pte))) { + VM_BUG_ON(!pfn_valid(pte_pfn(pte))); + return pte_page(pte); + } + VM_BUG_ON(!(vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))); + return NULL; + } + + /* !HAVE_PTE_SPECIAL case follows: */ + + pfn = pte_pfn(pte); if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) { if (vma->vm_flags & VM_MIXEDMAP) { @@ -424,7 +441,8 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, pte_ return NULL; goto out; } else { - unsigned long off = (addr-vma->vm_start) >> PAGE_SHIFT; + unsigned long off; + off = (addr - vma->vm_start) >> PAGE_SHIFT; if (pfn == vma->vm_pgoff + off) return NULL; if (!is_cow_mapping(vma->vm_flags)) @@ -432,25 +450,12 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, pte_ } } -#ifdef CONFIG_DEBUG_VM - /* - * Add some anal sanity checks for now. Eventually, - * we should just do "return pfn_to_page(pfn)", but - * in the meantime we check that we get a valid pfn, - * and that the resulting page looks ok. - */ - if (unlikely(!pfn_valid(pfn))) { - print_bad_pte(vma, pte, addr); - return NULL; - } -#endif + VM_BUG_ON(!pfn_valid(pfn)); /* - * NOTE! We still have PageReserved() pages in the page - * tables. + * NOTE! We still have PageReserved() pages in the page tables. * - * The PAGE_ZERO() pages and various VDSO mappings can - * cause them to exist. + * eg. VDSO mappings can cause them to exist. */ out: return pfn_to_page(pfn); @@ -1263,6 +1268,12 @@ int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, pte_t *pte, entry; spinlock_t *ptl; + /* + * Technically, architectures with pte_special can avoid all these + * restrictions (same for remap_pfn_range). However we would like + * consistency in testing and feature parity among all, so we should + * try to keep these invariants in place for everybody. + */ BUG_ON(!(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))); BUG_ON((vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) == (VM_PFNMAP|VM_MIXEDMAP)); @@ -1278,7 +1289,7 @@ int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, goto out_unlock; /* Ok, finally just insert the thing.. */ - entry = pfn_pte(pfn, vma->vm_page_prot); + entry = pte_mkspecial(pfn_pte(pfn, vma->vm_page_prot)); set_pte_at(mm, addr, pte, entry); update_mmu_cache(vma, addr, entry); @@ -1309,7 +1320,7 @@ static int remap_pte_range(struct mm_struct *mm, pmd_t *pmd, arch_enter_lazy_mmu_mode(); do { BUG_ON(!pte_none(*pte)); - set_pte_at(mm, addr, pte, pfn_pte(pfn, prot)); + set_pte_at(mm, addr, pte, pte_mkspecial(pfn_pte(pfn, prot))); pfn++; } while (pte++, addr += PAGE_SIZE, addr != end); arch_leave_lazy_mmu_mode(); |
