[PATCH] unpaged: VM_UNPAGED

Although we tend to associate VM_RESERVED with remap_pfn_range, quite a few
drivers set VM_RESERVED on areas which are then populated by nopage.  The
PageReserved removal in 2.6.15-rc1 changed VM_RESERVED not to free pages in
zap_pte_range, without changing those drivers not to set it: so their pages
just leak away.

Let's not change miscellaneous drivers now: introduce VM_UNPAGED at the core,
to flag the special areas where the ptes may have no struct page, or if they
have then it's not to be touched.  Replace most instances of VM_RESERVED in
core mm by VM_UNPAGED.  Force it on in remap_pfn_range, and the sparc and
sparc64 io_remap_pfn_range.

Revert addition of VM_RESERVED to powerpc vdso, it's not needed there.  Is it
needed anywhere?  It still governs the mm->reserved_vm statistic, and special
vmas not to be merged, and areas not to be core dumped; but could probably be
eliminated later (the drivers are probably specifying it because in 2.4 it
kept swapout off the vma, but in 2.6 we work from the LRU, which these pages
don't get on).

Use the VM_SHM slot for VM_UNPAGED, and define VM_SHM to 0: it serves no
purpose whatsoever, and should be removed from drivers when we clean up.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Acked-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 3 insertions, 4 deletions

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 0d4d8bec0df4..b44b36e0c293 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -285,8 +285,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm,
          * It's fine to use that for setting breakpoints in the vDSO code
          * pages though
          */
-        vma->vm_flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE |
-                VM_MAYEXEC | VM_RESERVED;
+        vma->vm_flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
         vma->vm_flags |= mm->def_flags;
         vma->vm_page_prot = protection_map[vma->vm_flags & 0x7];
         vma->vm_ops = &vdso_vmops;
diff --git a/arch/sparc/mm/generic.c b/arch/sparc/mm/generic.c
index 9604893ffdbd..0410bae681f8 100644
--- a/arch/sparc/mm/generic.c
+++ b/arch/sparc/mm/generic.c
@@ -74,7 +74,7 @@ int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
         unsigned long offset = GET_PFN(pfn) << PAGE_SHIFT;
 
         /* See comment in mm/memory.c remap_pfn_range */
-        vma->vm_flags |= VM_IO | VM_RESERVED;
+        vma->vm_flags |= VM_IO | VM_RESERVED | VM_UNPAGED;
 
         prot = __pgprot(pg_iobits);
         offset -= from;
diff --git a/arch/sparc64/mm/generic.c b/arch/sparc64/mm/generic.c
index 112c316e7cd2..8fd4cb1f050a 100644
--- a/arch/sparc64/mm/generic.c
+++ b/arch/sparc64/mm/generic.c
@@ -128,7 +128,7 @@ int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
         unsigned long offset = GET_PFN(pfn) << PAGE_SHIFT;
 
         /* See comment in mm/memory.c remap_pfn_range */
-        vma->vm_flags |= VM_IO | VM_RESERVED;
+        vma->vm_flags |= VM_IO | VM_RESERVED | VM_UNPAGED;
 
         prot = __pgprot(pg_iobits);
         offset -= from;