linux-kernel - Re: [PATCH, RFC 14/22] oprofile: always enable IRQ

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Message-ID: <1367587818.7373.12.camel@gandalf.local.home>
Date:	Fri, 03 May 2013 09:30:18 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Robert Richter <rric@...nel.org>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, oprofile-list@...ts.sf.net
Subject: Re: [PATCH, RFC 14/22] oprofile: always enable IRQ_WORK

On Fri, 2013-05-03 at 13:53 +0200, Robert Richter wrote:
> On 02.05.13 17:16:18, Arnd Bergmann wrote:
> > oprofile fails to build if CONFIG_IRQ_WORK is not already enabled,
> > because of the dependency on the RING_BUFFER code that now uses
> > the irq work library.
> > 
> > kernel/built-in.o: In function `ring_buffer_unlock_commit':
> > :(.text+0x5b8f0): undefined reference to `irq_work_queue'
> > kernel/built-in.o: In function `ring_buffer_write':
> > :(.text+0x5bd10): undefined reference to `irq_work_queue'
> 
> Shouldn't this be fixed in the ring_buffer implementation?

Hmm, I thought I had ring buffer select irq work. I must have not have
done that.

> 
> I also do not see, where this comes from. I was successfully compiling
> a kernel with OPROFILE and RING_BUFFER enabled but IRQ_WORK disabled.
> Do you have that config still available?
> 

The ring buffer code can now wake up waiters, and to do so it requires
irq_work. I'll send a patch.

Thanks,

-- Steve



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