linux-kernel - Re: [RFC PATCH 01/11] x86,fpu: document the data structures a little

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Date:	Mon, 12 Jan 2015 13:52:16 -0800
From:	Dave Hansen <dave.hansen@...el.com>
To:	riel@...hat.com, linux-kernel@...r.kernel.org
CC:	mingo@...hat.com, hpa@...or.com, matt.fleming@...el.com,
	bp@...e.de, oleg@...hat.com, pbonzini@...hat.com,
	tglx@...utronix.de, luto@...capital.net
Subject: Re: [RFC PATCH 01/11] x86,fpu: document the data structures a little

On 01/11/2015 01:46 PM, riel@...hat.com wrote:
> +/*
> + * The FPU state used depends on the capabilities of the hardware; the
> + * registers used for vector instructions on newer hardware are included
> + * in the FPU state.
> + */
>  union thread_xstate {

Tiny nit, if you happen to revise this set at some point...

While you probably don't need/want to have an exhaustive list of
everything that gets saved in there, we should probably still mention
that it's a lot more than just vector instructions.

I'd say:

	The FPU state used depends on the capabilities of the
	hardware.  This state increasingly contains things
	not related to the FPU itself, like registers used for
	vector instructions.
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