linux-kernel - Re: [PATCH v5 7/14] x86 support for Uprobes

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Date:	Mon, 21 Jun 2010 10:12:40 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Mel Gorman <mel@....ul.ie>,
	Randy Dunlap <rdunlap@...otime.net>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Roland McGrath <roland@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Mark Wielaard <mjw@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH v5 7/14] x86 support for Uprobes

On Tue, 2010-06-15 at 17:45 +0530, Srikar Dronamraju wrote:

> local_irq_enable() translates to raw_local_irq_enable().
> However raw_local_irq_enable on x86 seems to depend on CONFIG_PARAVIRT.
> On a machine, where CONFIG_PARAVIRT was defined, local_irq_enable
> translates to something other than native_irq_enable.
> It translates to PVOP_VCALLEE0(pv_irq_ops.irq_enable);
> 
> Is it okay to use local_irq_enable() and then make CONFIG_UPROBES depend
> on !CONFIG_PARAVIRT?
> 

It should still work under paravirt. If it does not, we need to figurure
out why.

On boot up, when CONFIG_PARAVIRT is set but the kernel is running on
bare metal, a lot of the calls to things like "pv_irq_ops.irq_enabled"
are converted to the native caller anyway. Perhaps the conversion messed
up?

-- Steve


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