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

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Message-ID: <A5ED84D3BB3A384992CBB9C77DEDA4D414ACBC2D@USINDEM103.corp.hds.com>
Date:	Tue, 19 Feb 2013 21:00:45 +0000
From:	Seiji Aguchi <seiji.aguchi@....com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	"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

OK. I will update my patch.

Seiji

> -----Original Message-----
> From: Steven Rostedt [mailto:rostedt@...dmis.org]
> Sent: Tuesday, February 19, 2013 1:41 PM
> To: H. Peter Anvin
> Cc: Seiji Aguchi; x86@...nel.org; linux-kernel@...r.kernel.org; Thomas Gleixner (tglx@...utronix.de); 'mingo@...e.hu'
> (mingo@...e.hu); Borislav Petkov (bp@...en8.de); Satoru Moriya; dle-develop@...ts.sourceforge.net; linux-edac@...r.kernel.org;
> Luck, Tony (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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