linux-kernel - Re: [RFC v4 1/2] x86/xen: add xen_is_preemptible

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Date:	Tue, 27 Jan 2015 02:45:54 +0100
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>, kvm list <kvm@...r.kernel.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Jan Beulich <JBeulich@...e.com>
Subject: Re: [RFC v4 1/2] x86/xen: add xen_is_preemptible_hypercall()

On Thu, Jan 22, 2015 at 05:40:45PM -0800, Andy Lutomirski wrote:
> On Thu, Jan 22, 2015 at 4:29 PM, Luis R. Rodriguez
> <mcgrof@...not-panic.com> wrote:
> > From: "Luis R. Rodriguez" <mcgrof@...e.com>
> >
> > On kernels with voluntary or no preemption we can run
> > into situations where a hypercall issued through userspace
> > will linger around as it addresses sub-operatiosn in kernel
> > context (multicalls). Such operations can trigger soft lockup
> > detection.
> 
> Looks reasonable.

I'll add a reviewed-by...

  LUis
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