diff options
author | Kumar Gala <galak@kernel.crashing.org> | 2007-02-12 23:57:21 -0600 |
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committer | Kumar Gala <galak@kernel.crashing.org> | 2007-02-12 23:57:21 -0600 |
commit | 54c66f6d781e03dc0b23956234963c4911e6d1c0 (patch) | |
tree | 40619a66ae6d8703a57bf681d087ffeabbffd346 /mm/memory.c | |
parent | 8ce0a7df6e6117d8814e976d4b7ce6a6b2c9cf93 (diff) | |
parent | 17e0e27020d028a790d97699aff85a43af5be472 (diff) |
Merge branch 'master' into 85xx
Diffstat (limited to 'mm/memory.c')
-rw-r--r-- | mm/memory.c | 60 |
1 files changed, 52 insertions, 8 deletions
diff --git a/mm/memory.c b/mm/memory.c index ef09f0acb1d..e7066e71dfa 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -678,7 +678,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb, if (pte_dirty(ptent)) set_page_dirty(page); if (pte_young(ptent)) - mark_page_accessed(page); + SetPageReferenced(page); file_rss--; } page_remove_rmap(page, vma); @@ -1277,6 +1277,51 @@ int vm_insert_page(struct vm_area_struct *vma, unsigned long addr, struct page * } EXPORT_SYMBOL(vm_insert_page); +/** + * vm_insert_pfn - insert single pfn into user vma + * @vma: user vma to map to + * @addr: target user address of this page + * @pfn: source kernel pfn + * + * Similar to vm_inert_page, this allows drivers to insert individual pages + * they've allocated into a user vma. Same comments apply. + * + * This function should only be called from a vm_ops->fault handler, and + * in that case the handler should return NULL. + */ +int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, + unsigned long pfn) +{ + struct mm_struct *mm = vma->vm_mm; + int retval; + pte_t *pte, entry; + spinlock_t *ptl; + + BUG_ON(!(vma->vm_flags & VM_PFNMAP)); + BUG_ON(is_cow_mapping(vma->vm_flags)); + + retval = -ENOMEM; + pte = get_locked_pte(mm, addr, &ptl); + if (!pte) + goto out; + retval = -EBUSY; + if (!pte_none(*pte)) + goto out_unlock; + + /* Ok, finally just insert the thing.. */ + entry = pfn_pte(pfn, vma->vm_page_prot); + set_pte_at(mm, addr, pte, entry); + update_mmu_cache(vma, addr, entry); + + retval = 0; +out_unlock: + pte_unmap_unlock(pte, ptl); + +out: + return retval; +} +EXPORT_SYMBOL(vm_insert_pfn); + /* * maps a range of physical memory into the requested pages. the old * mappings are removed. any references to nonexistent pages results @@ -1531,8 +1576,6 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma, if (vma->vm_ops->page_mkwrite(vma, old_page) < 0) goto unwritable_page; - page_cache_release(old_page); - /* * Since we dropped the lock we need to revalidate * the PTE as someone else may have changed it. If @@ -1541,6 +1584,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma, */ page_table = pte_offset_map_lock(mm, pmd, address, &ptl); + page_cache_release(old_page); if (!pte_same(*page_table, orig_pte)) goto unlock; } @@ -1776,9 +1820,7 @@ restart: } /** - * unmap_mapping_range - unmap the portion of all mmaps - * in the specified address_space corresponding to the specified - * page range in the underlying file. + * unmap_mapping_range - unmap the portion of all mmaps in the specified address_space corresponding to the specified page range in the underlying file. * @mapping: the address space containing mmaps to be unmapped. * @holebegin: byte in first page to unmap, relative to the start of * the underlying file. This will be rounded down to a PAGE_SIZE @@ -2313,10 +2355,12 @@ static noinline int do_no_pfn(struct mm_struct *mm, struct vm_area_struct *vma, BUG_ON(is_cow_mapping(vma->vm_flags)); pfn = vma->vm_ops->nopfn(vma, address & PAGE_MASK); - if (pfn == NOPFN_OOM) + if (unlikely(pfn == NOPFN_OOM)) return VM_FAULT_OOM; - if (pfn == NOPFN_SIGBUS) + else if (unlikely(pfn == NOPFN_SIGBUS)) return VM_FAULT_SIGBUS; + else if (unlikely(pfn == NOPFN_REFAULT)) + return VM_FAULT_MINOR; page_table = pte_offset_map_lock(mm, pmd, address, &ptl); |