linux-kernel - Re: [PATCH v9 2/3] trace,x86: add x86 irq vector tracepoints

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Message-ID: <1361248883.23152.199.camel@gandalf.local.home>
Date:	Mon, 18 Feb 2013 23:41:23 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Seiji Aguchi <seiji.aguchi@....com>,
	"x86@...nel.org" <x86@...nel.org>,
	"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: [PATCH v9 2/3] trace,x86: add x86 irq vector tracepoints

On Mon, 2013-02-18 at 20:39 -0800, H. Peter Anvin wrote:

> > static void switch_to_trace_idt(void *arg)
> > {
> >      load_idt(&trace_idt_descr);
> > }
> > 
> > static void restore_original_idt(void *arg)
> > {
> >      load_idt(this_cpu_ptr(&idt_descr));
> > }
> > 
> 
> Yes.  If there needs to be handshaking about whose IDT is currently
> installed I'm much happier if that handshake is done explicitly, rather
> than as a save/restore function which will break when we have to add
> another one which for whatever reason isn't nesting.

Agreed.

Seiji, can you make the update?

Thanks,

-- Steve


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