Re: arm: Request to preserve TPIDRURW per thread

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Jan 22, 2013 at 01:04:56AM +0100, André Hentschel wrote:
> Hi,
> that comes a bit late, but [1] asked for objections.
> As you can see in [2] there are more and more applications coming to WinRT, Wine could support them,
> but mostly they expect to have the thread environment block (TEB) in TPIDRURW.
> This register must be preserved per thread and we have patches for that.
> 
> Currently there exist two kernel behaviours:
> 
> 1. the kernel does not touch TPIDRURW at all ("covert channel")
> 2. the kernel clears TPIDRURW on thread switch
> 
> Attached to [3] you'll find kernel patches you can freely use.
> Permission and more info you'll find in [4].
> Any hints or suggestions?
> 
> [1] http://www.kernelhub.org/?p=2&msg=57979
> [2] http://forum.xda-developers.com/showthread.php?t=2092348
> [3] http://bugs.winehq.org/show_bug.cgi?id=31322
> [4] http://bugs.winehq.org/show_bug.cgi?id=31308

Please submit the patches to fix this in the way described in
Documentation/SubmittingPatches.  Once they are in Linus's tree, I'll be
glad to take them in the stable tree if they meet the guidelines that
are described in Documentation/stable_kernel_rules.txt.

Does that help?

thanks,

greg k-h