Messages in this thread | | | Date | Sun, 13 Nov 2005 04:54:17 +0200 | From | Matti Aarnio <> | Subject | Re: [x86_64] 2.6.14-git13 mplayer fails with "v4l2: ioctl queue buffer failed: Bad address" (2 Nov 2005, 11 Nov 2005) |
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On Sun, Nov 13, 2005 at 01:22:51AM +0300, Nickolay V. Shmyrev wrote: > Hello all. > > We have even found the hack that fix that problem:
A hack, but working one.. (for the small while that I tested it)
> Index: linux/drivers/media/video/video-buf.c > =================================================================== > RCS file: /cvs/video4linux/v4l-kernel/linux/drivers/media/video/video-buf.c,v > retrieving revision 1.21 > diff -u -p -r1.21 video-buf.c > --- linux/drivers/media/video/video-buf.c 16 Oct 2005 12:13:58 -0000 > +++ linux/drivers/media/video/video-buf.c 12 Nov 2005 22:19:13 -0000 > @@ -1248,7 +1248,7 @@ int videobuf_mmap_mapper(struct videobuf > map->end = vma->vm_end; > map->q = q; > vma->vm_ops = &videobuf_vm_ops; > - vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED; > + vma->vm_flags |= VM_DONTEXPAND; > vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */ > vma->vm_private_data = map; > dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n", > > Somehow since 2.6.15-rc1 VM_RESERVED makes get_user_pages return EFAULT. > I don't know the exact reason of that behavior and the correct way to fix > that problem. Just kernel interfaces changed once again, the old > point everyone knows. So if someone can explain it, that would be helpful.
This EFAULT rejection is due to change in get_user_pages() function in mm/memory.c file of 2.6.14-git2
@@ -945,8 +947,8 @@ int get_user_pages(struct task_struct *t continue; } - if (!vma || (vma->vm_flags & VM_IO) - || !(flags & vma->vm_flags)) + if (!vma || (vma->vm_flags & (VM_IO | VM_RESERVED)) + || !(vm_flags & vma->vm_flags)) return i ? : -EFAULT; if (is_vm_hugetlb_page(vma)) {
I don't know how to use git tools to see, whose patch actually did this particular change.
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