linux-kernel - Re: [PATCH 2/2] x86/fpu: factor out memset(xstate, 0) in fpu

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Date:	Tue, 03 Mar 2015 17:01:01 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>, Tavis Ormandy <taviso@...gle.com>,
	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>
CC:	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] x86/fpu: factor out memset(xstate, 0) in fpu_finit()
 paths

On 03/02/2015 01:32 PM, Oleg Nesterov wrote:
> fx_finit() has 2 users but only fpu_finit() needs to nullify xstate,
> alloc_bootmem_align() in setup_init_fpu_buf() returns zero-filled
> memory.
> 
> And note that both memset()'s look confusing. Yes, offsetof() is 0
> for ->fxsave or ->fsave, but it would be more clean to turn them into
> a single memset() which nullifies fpu->state.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Acked-by: Rik van Riel <riel@...hat.com>

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