linux-kernel - Re: [v4] powerpc: Export thread_struct.used_vr/used

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Message-ID: <20160708053901.GA6489@simonLocalRHEL7.x64>
Date:	Fri, 8 Jul 2016 13:39:01 +0800
From:	Simon Guo <wei.guo.simon@...il.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Laurent Dufour <ldufour@...ux.vnet.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	Paul Mackerras <paulus@...ba.org>,
	Kees Cook <keescook@...omium.org>,
	Rashmica Gupta <rashmicy@...il.com>
Subject: Re: [v4] powerpc: Export thread_struct.used_vr/used_vsr to user space

On Thu, Jul 07, 2016 at 11:21:18PM +1000, Benjamin Herrenschmidt wrote:
> I think the right fix is that if a restore_sigcontext() has the MSR bits set,
> it should set the corresponding used_* flag.
> 
> Or is there a reason why that won't work ?

That sounds reaonable to me.
I will prepare a patch based on that.

Michael, Ben, Laurent,
Thanks the discussion and proposal.

- Simon