diff options
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index 67f0ab9077d..0e4eea10c7b 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -993,6 +993,30 @@ unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address, tlb_finish_mmu(tlb, address, end); return end; } +EXPORT_SYMBOL_GPL(zap_page_range); + +/** + * zap_vma_ptes - remove ptes mapping the vma + * @vma: vm_area_struct holding ptes to be zapped + * @address: starting address of pages to zap + * @size: number of bytes to zap + * + * This function only unmaps ptes assigned to VM_PFNMAP vmas. + * + * The entire address range must be fully contained within the vma. + * + * Returns 0 if successful. + */ +int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, + unsigned long size) +{ + if (address < vma->vm_start || address + size > vma->vm_end || + !(vma->vm_flags & VM_PFNMAP)) + return -1; + zap_page_range(vma, address, size, NULL); + return 0; +} +EXPORT_SYMBOL_GPL(zap_vma_ptes); /* * Do a quick page-table lookup for a single page. @@ -1087,6 +1111,7 @@ no_page_table: } return page; } +EXPORT_SYMBOL_GPL(follow_page); /* Can we do the FOLL_ANON optimization? */ static inline int use_zero_page(struct vm_area_struct *vma) |