linux-kernel - Re: [PATCH v4 2/5] x86, traps: Track entry into and exit from IST context

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Message-ID: <CA+8MBbKbuyYWKK_wK1pwX_T39dKmukBom+i7H5dndfjhDJahbQ@mail.gmail.com>
Date:	Mon, 5 Jan 2015 13:46:24 -0800
From:	Tony Luck <tony.luck@...il.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Borislav Petkov <bp@...en8.de>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	X86 ML <x86@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Josh Triplett <josh@...htriplett.org>,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH v4 2/5] x86, traps: Track entry into and exit from IST context

On Wed, Dec 10, 2014 at 4:24 PM, Andy Lutomirski <luto@...capital.net> wrote:
> I think you need ist_begin_non_atomic() before local_irq_enable() and
> ist_end_non_atomic() after local_irq_disable().  Otherwise it should
> be good.

In your x86/paranoid branch you added:

     prev_state = ist_enter(regs);
          .... body of do_machine_check() here ...
     ist_exit(regs, prev_state);

Does that override the previous advice? Or do I still need something before
I call local_irq_enable() and after local_irq_disable()?

-Tony
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