linux-kernel - [PATCH] perf_counter: fix ioctl()s

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Date:	Tue, 12 May 2009 12:59:33 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] perf_counter: fix ioctl()s

On Tue, 2009-05-12 at 09:52 +0200, Arnd Bergmann wrote:
> On Tuesday 12 May 2009, Peter Zijlstra wrote:
> > Ah, so _IO() gets an unsigned long 3rd argument.
> > _IOW() treats the 3rd arg as a (type __user *) and copies the bits over
> > _IOR() copies the bits back out to userspace
> > _IORW() does both
> > 
> > In which case the below should fix things up, no?
> > 
> 
> Yes, this looks good now.

---
Arnd spotted that I misunderstood and wrongly used the 3rd ioctl
argument. Fix up the perf counter ioctl()s to use the 3rd argument as
value -- as opposed to a pointer as would now be the case.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 include/linux/perf_counter.h |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 614f921..6a9cebc 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -159,10 +159,10 @@ struct perf_counter_hw_event {
 /*
  * Ioctls that can be done on a perf counter fd:
  */
-#define PERF_COUNTER_IOC_ENABLE		_IOW('$', 0, u32)
-#define PERF_COUNTER_IOC_DISABLE	_IOW('$', 1, u32)
-#define PERF_COUNTER_IOC_REFRESH	_IOW('$', 2, u32)
-#define PERF_COUNTER_IOC_RESET		_IOW('$', 3, u32)
+#define PERF_COUNTER_IOC_ENABLE		_IO('$', 0)
+#define PERF_COUNTER_IOC_DISABLE	_IO('$', 1)
+#define PERF_COUNTER_IOC_REFRESH	_IO('$', 2)
+#define PERF_COUNTER_IOC_RESET		_IO('$', 3)
 
 enum perf_counter_ioc_flags {
 	PERF_IOC_FLAG_GROUP		= 1U << 0,

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