linux-kernel - Re: [RFC PATCH 04/11] x86,fpu: defer FPU restore until return to userspace

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Message-ID: <20150113183003.GB30475@redhat.com>
Date:	Tue, 13 Jan 2015 19:30:03 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	matt.fleming@...el.com, bp@...e.de, pbonzini@...hat.com,
	tglx@...utronix.de, luto@...capital.net
Subject: Re: [RFC PATCH 04/11] x86,fpu: defer FPU restore until return to
	userspace

On 01/13, Oleg Nesterov wrote:
>
> But yes, I think we need the per-cpu "in_kernel_fpu" and irq_fpu_usable()
> must die. Please look at http://marc.info/?l=linux-kernel&m=14096628660929

Plus I think we need this to fix the race with math_state_restore()...
Please see http://marc.info/?l=linux-kernel&m=140992479607206

Unfortunately I forgot other problems I found in this area... And
I completely forgot the plan I had in mind ;)

Oleg.

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