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

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Date:	Tue, 5 May 2015 11:51:11 +0100
From:	Will Deacon <will.deacon@....com>
To:	André Hentschel <nerv@...ncrow.de>
Cc:	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	Jonathan Austin <Jonathan.Austin@....com>,
	Nathan Lynch <nathan_lynch@...tor.com>
Subject: Re: [PATCH] arm64: Preserve the user r/w register tpidr_el0 on
 context switch and fork in compat mode

On Sun, May 03, 2015 at 05:24:18PM +0100, André Hentschel wrote:
> From: André Hentschel <nerv@...ncrow.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@...ncrow.de>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Jonathan Austin <jonathan.austin@....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
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