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    Subject[PATCH] rmap 29 VM_RESERVED safety
    From: Andrea Arcangeli <andrea@suse.de>

    Set VM_RESERVED in videobuf_mmap_mapper, to warn do_no_page and swapout
    not to worry about its pages. Set VM_RESERVED in ia64_elf32_init, it
    too provides an unusual nopage which might surprise higher level checks.
    Future safety: they don't actually pose a problem in this current tree.

    arch/ia64/ia32/binfmt_elf32.c | 2 +-
    drivers/media/video/video-buf.c | 2 +-
    2 files changed, 2 insertions(+), 2 deletions(-)

    --- rmap28/arch/ia64/ia32/binfmt_elf32.c 2004-05-08 20:55:05.446550456 +0100
    +++ rmap29/arch/ia64/ia32/binfmt_elf32.c 2004-05-08 20:55:27.517195208 +0100
    @@ -78,7 +78,7 @@ ia64_elf32_init (struct pt_regs *regs)
    vma->vm_start = IA32_GDT_OFFSET;
    vma->vm_end = vma->vm_start + PAGE_SIZE;
    vma->vm_page_prot = PAGE_SHARED;
    - vma->vm_flags = VM_READ|VM_MAYREAD;
    + vma->vm_flags = VM_READ|VM_MAYREAD|VM_RESERVED;
    vma->vm_ops = &ia32_shared_page_vm_ops;
    down_write(&current->mm->mmap_sem);
    {
    --- rmap28/drivers/media/video/video-buf.c 2004-04-04 03:38:43.000000000 +0100
    +++ rmap29/drivers/media/video/video-buf.c 2004-05-08 20:55:27.519194904 +0100
    @@ -1176,7 +1176,7 @@ int videobuf_mmap_mapper(struct vm_area_
    map->end = vma->vm_end;
    map->q = q;
    vma->vm_ops = &videobuf_vm_ops;
    - vma->vm_flags |= VM_DONTEXPAND;
    + vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
    vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */
    vma->vm_private_data = map;
    dprintk(1,"mmap %p: %08lx-%08lx pgoff %08lx bufs %d-%d\n",
    -
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