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Re: mm: VM_BUG_ON_PAGE(PageTail(page)) in mbind

From Andrew Morton <akpm@linux-foundation.org>
Newsgroups linux.kernel
Subject Re: mm: VM_BUG_ON_PAGE(PageTail(page)) in mbind
Date 2016-01-26 21:50 +0100
Message-ID <qViIN-1ad-9@gated-at.bofh.it> (permalink)
References <qVbo0-4eF-33@gated-at.bofh.it> <qVipt-Vs-25@gated-at.bofh.it>
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On Tue, 26 Jan 2016 22:28:29 +0200 "Kirill A. Shutemov" <kirill@shutemov.name> wrote:

> Let's mark the VMA as VM_IO to indicate to mm core that the VMA is
> migratable.
> 
> ...
>
> --- a/drivers/scsi/sg.c
> +++ b/drivers/scsi/sg.c
> @@ -1261,7 +1261,7 @@ sg_mmap(struct file *filp, struct vm_area_struct *vma)
>  	}
>  
>  	sfp->mmap_called = 1;
> -	vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
> +	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
>  	vma->vm_private_data = sfp;
>  	vma->vm_ops = &sg_mmap_vm_ops;
>  	return 0;

I'll put cc:stable on this - I don't think we recently did anything to make
this happen?

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Thread

mm: VM_BUG_ON_PAGE(PageTail(page)) in mbind Dmitry Vyukov <dvyukov@google.com> - 2016-01-26 14:00 +0100
  Re: mm: VM_BUG_ON_PAGE(PageTail(page)) in mbind "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-01-26 21:30 +0100
    Re: mm: VM_BUG_ON_PAGE(PageTail(page)) in mbind Andrew Morton <akpm@linux-foundation.org> - 2016-01-26 21:50 +0100
      Re: mm: VM_BUG_ON_PAGE(PageTail(page)) in mbind "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-01-26 22:10 +0100
    Re: mm: VM_BUG_ON_PAGE(PageTail(page)) in mbind Andrew Morton <akpm@linux-foundation.org> - 2016-01-26 21:50 +0100
      Re: mm: VM_BUG_ON_PAGE(PageTail(page)) in mbind "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-01-26 22:10 +0100
    Re: mm: VM_BUG_ON_PAGE(PageTail(page)) in mbind Vlastimil Babka <vbabka@suse.cz> - 2016-01-26 22:40 +0100

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