From: Arnd Bergmann <arnd@arndb.de>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>, Paul Mackerras <paulus@samba.org>,
Corey Ashford <cjashfor@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 3/5] perf_counter: rework ioctl()s
Date: Tue, 12 May 2009 01:58:45 +0200 [thread overview]
Message-ID: <200905120158.46314.arnd@arndb.de> (raw)
In-Reply-To: <20090508170028.837558214@chello.nl>
On Friday 08 May 2009, Peter Zijlstra wrote:
> -#define PERF_COUNTER_IOC_ENABLE _IO ('$', 0)
> -#define PERF_COUNTER_IOC_DISABLE _IO ('$', 1)
> +#define PERF_COUNTER_IOC_ENABLE _IOW('$', 0, u32)
> +#define PERF_COUNTER_IOC_DISABLE _IOW('$', 1, u32)
> #define PERF_COUNTER_IOC_REFRESH _IOW('$', 2, u32)
> -#define PERF_COUNTER_IOC_RESET _IO ('$', 3)
> +#define PERF_COUNTER_IOC_RESET _IOW('$', 3, u32)
These ioctl definitions look malformed:
_IOW('$', 0, u32) means that the ioctl will read a u32 in user
space pointed to by (u32 __user *)arg, while what perf_ioctl
actually does is cast arg to a u32. Moreover, exported headers
should use __u32 instead of u32.
PERF_COUNTER_IOC_REFRESH apparently was broken already, this
patch also breaks the other definitions.
Arnd <><
next prev parent reply other threads:[~2009-05-11 23:59 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-08 16:52 [PATCH 0/5] pending patches Peter Zijlstra
2009-05-08 16:52 ` [PATCH 1/5] hrtimer: per-cpu cached values of ktime Peter Zijlstra
2009-05-08 23:10 ` Andrew Morton
2009-05-09 19:45 ` Linus Torvalds
2009-05-09 19:59 ` Peter Zijlstra
2009-05-08 16:52 ` [PATCH 2/5] perf_counter: optimize perf_counter_task_tick() Peter Zijlstra
2009-05-08 18:39 ` [tip:perfcounters/core] " tip-bot for Peter Zijlstra
2009-05-08 16:52 ` [PATCH 3/5] perf_counter: rework ioctl()s Peter Zijlstra
2009-05-08 18:39 ` [tip:perfcounters/core] " tip-bot for Peter Zijlstra
2009-05-11 1:29 ` [PATCH 3/5] " Paul Mackerras
2009-05-11 15:12 ` Peter Zijlstra
2009-05-12 6:24 ` Paul Mackerras
2009-05-11 18:12 ` Corey Ashford
2009-05-11 20:52 ` Paul Mackerras
2009-05-11 22:37 ` Corey Ashford
2009-05-12 6:16 ` Paul Mackerras
2009-05-12 16:15 ` Corey Ashford
2009-05-12 22:18 ` Paul Mackerras
2009-05-12 22:51 ` Corey Ashford
2009-05-11 23:58 ` Arnd Bergmann [this message]
2009-05-12 6:11 ` Peter Zijlstra
2009-05-12 6:22 ` Paul Mackerras
2009-05-12 6:27 ` Peter Zijlstra
2009-05-12 7:10 ` Peter Zijlstra
2009-05-12 7:52 ` Arnd Bergmann
2009-05-12 10:59 ` [PATCH] perf_counter: fix ioctl()s Peter Zijlstra
2009-05-12 11:21 ` [PATCH 3/5] perf_counter: rework ioctl()s Paul Mackerras
2009-05-08 16:52 ` [PATCH 4/5] perf_counter: PERF_RECORD_CONFIG Peter Zijlstra
2009-05-08 18:39 ` [tip:perfcounters/core] perf_counter: add PERF_RECORD_CONFIG tip-bot for Peter Zijlstra
2009-05-08 16:52 ` [PATCH 5/5] perf_counter: PERF_RECORD_CPU Peter Zijlstra
2009-05-08 18:40 ` [tip:perfcounters/core] perf_counter: add PERF_RECORD_CPU tip-bot for Peter Zijlstra
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