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 <torvalds@osdl.org>
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 9ab97ce..50bd5a8f 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -402,12 +402,11 @@
/*
* 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 @@
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);