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mm: re-architect the VM_UNPAGED logic

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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>
This commit is contained in:
Linus Torvalds
2005-11-28 14:34:23 -08:00
parent 458af5439f
commit 6aab341e0a
11 changed files with 127 additions and 146 deletions
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7
fs/proc/task_mmu.c
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@ -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);