linux-kernel - Re: [PATCH v2 1/3] x86/entry/64: Refactor IRQ stacks and make them NMI-safe

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Message-ID: <20150728094153.GB1612@nazgul.tnic>
Date:	Tue, 28 Jul 2015 11:41:53 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	X86 ML <x86@...nel.org>, linux-kernel@...r.kernel.org,
	Brian Gerst <brgerst@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>, Willy Tarreau <w@....eu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v2 1/3] x86/entry/64: Refactor IRQ stacks and make them
 NMI-safe

On Fri, Jul 24, 2015 at 10:57:04PM -0700, Andy Lutomirski wrote:
> This will allow IRQ stacks to nest inside NMIs or similar entries
> that can happen during IRQ stack setup or teardown.
> 
> The Xen code here has a confusing comment.
> 
> The new macros won't work correctly if they're invoked with IRQs on.
> Add a check under CONFIG_DEBUG_ENTRY to detect that.
> 
> Signed-off-by: Andy Lutomirski <luto@...nel.org>
> ---
>  arch/x86/Kconfig.debug       |  2 -
>  arch/x86/entry/entry_64.S    | 89 +++++++++++++++++++++++++++++---------------
>  arch/x86/kernel/process_64.c |  4 ++
>  3 files changed, 63 insertions(+), 32 deletions(-)

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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