diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-generic/pgtable.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index b9d72dd2996e..20f401dcffda 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -135,6 +135,27 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addres #define pgd_offset_gate(mm, addr) pgd_offset(mm, addr) #endif +/* + * When walking page tables, get the address of the next boundary, or + * the end address of the range if that comes earlier. Although end might + * wrap to 0 only in clear_page_range, __boundary may wrap to 0 throughout. + */ + +#define pgd_addr_end(addr, end) \ +({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \ + (__boundary - 1 < (end) - 1)? __boundary: (end); \ +}) + +#define pud_addr_end(addr, end) \ +({ unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK; \ + (__boundary - 1 < (end) - 1)? __boundary: (end); \ +}) + +#define pmd_addr_end(addr, end) \ +({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \ + (__boundary - 1 < (end) - 1)? __boundary: (end); \ +}) + #ifndef __ASSEMBLY__ /* * When walking page tables, we usually want to skip any p?d_none entries; |