[PATCH] arm64: Preserve the user r/w register tpidr_el0 on context switch and fork in compat mode

[Will Deacon]

On Sun, May 03, 2015 at 05:24:18PM +0100, André Hentschel wrote:
> From: André Hentschel <nerv at dawncrow.de>
> 
> Since commit a4780adeefd042482f624f5e0d577bf9cdcbb760 the user writeable TLS
> register on ARM is preserved per thread.
> 
> This patch does it analogous to the ARM patch, but for compat mode on ARM64.
> 
> Signed-off-by: André Hentschel <nerv at dawncrow.de>
> Cc: Will Deacon <will.deacon at arm.com>
> Cc: Jonathan Austin <jonathan.austin at arm.com> 
> 
> ---
> This patch is against Linux 4.1-rc1 (b787f68c36d49bb1d9236f403813641efa74a031)

Curious, but why do you need this? iirc, we added this for arch/arm/ because
of some windows rt (?) emulation in wine. Is that still the case here and is
anybody actually using that?

Will