linux-kernel - Re: [PATCH 1/4] vtime: Remove the underscore prefix invasion

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Date:	Wed, 14 Nov 2012 11:57:53 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH 1/4] vtime: Remove the underscore prefix invasion

On Wed, 2012-11-14 at 17:48 +0100, Frederic Weisbecker wrote:
> 2012/11/14 Steven Rostedt <rostedt@...dmis.org>:
> > On Wed, 2012-11-14 at 17:26 +0100, Frederic Weisbecker wrote:
> >> Prepending irq-unsafe vtime APIs with underscores was actually
> >> a bad idea as the result is a big mess in the API namespace that
> >> is even waiting to be further extended. Also these helpers
> >> are always called from irq safe callers except kvm. Just
> >> provide a vtime_account_system_irqsafe() for this specific
> >> case so that we can remove the underscore prefix on other
> >> vtime functions.
> >>
> >
> >
> >> -void __vtime_account_system(struct task_struct *tsk)
> >> +void vtime_account_system(struct task_struct *tsk)
> >>  {
> >>       cputime_t delta = vtime_delta(tsk);
> >
> > Should we add a WARN_ON(!irqs_disabled()) check here?
> 
> Why not, I'll add one in vtime_delta().

Probably make it a WARN_ON_ONCE() no need to spam the console.

-- Steve


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