linux-kernel - Re: [RFC][PATCH v8 2/3] trace,x86: add x86 irq vector tracepoints

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Message-ID: <1359756944.5642.50.camel@gandalf.local.home>
Date:	Fri, 01 Feb 2013 17:15:44 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Seiji Aguchi <seiji.aguchi@....com>
Cc:	"x86@...nel.org" <x86@...nel.org>,
	"H. Peter Anvin (hpa@...or.com)" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Thomas Gleixner (tglx@...utronix.de)" <tglx@...utronix.de>,
	"'mingo@...e.hu' (mingo@...e.hu)" <mingo@...e.hu>,
	"Borislav Petkov (bp@...en8.de)" <bp@...en8.de>,
	Satoru Moriya <satoru.moriya@....com>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"Luck, Tony (tony.luck@...el.com)" <tony.luck@...el.com>
Subject: Re: [RFC][PATCH v8 2/3] trace,x86: add x86 irq vector tracepoints

On Fri, 2013-02-01 at 21:06 +0000, Seiji Aguchi wrote:
> > > +#include <asm/hw_irq.h>
> > > +#include <asm/desc.h>
> > > +
> > > +static struct desc_ptr trace_idt_descr = { NR_VECTORS * 16 - 1,
> > > +				    (unsigned long) trace_idt_table };
> > > +
> > > +#ifndef CONFIG_X86_64
> > > +gate_desc trace_idt_table[NR_VECTORS] __page_aligned_data
> > > +					= { { { { 0, 0 } } }, };
> > > +#endif
> > > +
> > > +static struct desc_ptr orig_idt_descr[NR_CPUS];
> > 
> > BTW, this should be:
> > 
> > static DEFINE_PER_CPU(struct desc_ptr, orig_idt_descr);
> > 
> > And look at the patch I made about the NMI/DEBUG trap handling to see how to use it.
> 
> Thanks.
> I'm looking at your patch right now and will update my patch.

Also, don't forget to add the mutex protection that I suggested in
another email.

Thanks,

-- Steve


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