Re: [PATCH 3/4] x86,mm: Improve _install_special_mapping and fix x86 vdso naming

[Cyrill Gorcunov]

On Mon, May 19, 2014 at 03:58:33PM -0700, Andy Lutomirski wrote:
> Using arch_vma_name to give special mappings a name is awkward.  x86
> currently implements it by comparing the start address of the vma to
> the expected address of the vdso.  This requires tracking the start
> address of special mappings and is probably buggy if a special vma
> is split or moved.
> 
> Improve _install_special_mapping to just name the vma directly.  Use
> it to give the x86 vvar area a name, which should make CRIU's life
> easier.
> 
> As a side effect, the vvar area will show up in core dumps.  This
> could be considered weird and is fixable.  Thoughts?
> 
> Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
> Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
> Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>

Hi Andy, thanks a lot for this! I must confess I don't yet know how
would we deal with compat tasks but this is 'must have' mark which
allow us to detect vvar area!
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