path: root/fs
diff options
authorLinus Torvalds <>2005-11-28 14:34:23 -0800
committerLinus Torvalds <>2005-11-28 14:34:23 -0800
commit6aab341e0a28aff100a09831c5300a2994b8b986 (patch)
tree1af3908275aa5e1b16e80efee554a9a7504c56d4 /fs
parent458af5439fe7ae7d95ca14106844e61f0795166c (diff)
mm: re-architect the VM_UNPAGED logic
This replaces the (in my opinion horrible) VM_UNMAPPED logic with very explicit support for a "remapped page range" aka VM_PFNMAP. It allows a VM area to contain an arbitrary range of page table entries that the VM never touches, and never considers to be normal pages. Any user of "remap_pfn_range()" automatically gets this new functionality, and doesn't even have to mark the pages reserved or indeed mark them any other way. It just works. As a side effect, doing mmap() on /dev/mem works for arbitrary ranges. Sparc update from David in the next commit. Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'fs')
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 9ab97cef0daa..50bd5a8f0446 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -402,12 +402,11 @@ struct numa_maps {
* Calculate numa node maps for a vma
-static struct numa_maps *get_numa_maps(const struct vm_area_struct *vma)
+static struct numa_maps *get_numa_maps(struct vm_area_struct *vma)
+ int i;
struct page *page;
unsigned long vaddr;
- struct mm_struct *mm = vma->vm_mm;
- int i;
struct numa_maps *md = kmalloc(sizeof(struct numa_maps), GFP_KERNEL);
if (!md)
@@ -420,7 +419,7 @@ static struct numa_maps *get_numa_maps(const struct vm_area_struct *vma)
md->node[i] =0;
for (vaddr = vma->vm_start; vaddr < vma->vm_end; vaddr += PAGE_SIZE) {
- page = follow_page(mm, vaddr, 0);
+ page = follow_page(vma, vaddr, 0);
if (page) {
int count = page_mapcount(page);