linux-kernel - Re: [regression] sched_getaffinity fails with EINVAL in 2.6.31-rc4

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Message-ID: <alpine.DEB.2.00.0907271108350.8408@chino.kir.corp.google.com>
Date:	Mon, 27 Jul 2009 11:12:15 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Gregory Haskins <gregory.haskins@...il.com>
cc:	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [regression] sched_getaffinity fails with EINVAL in 2.6.31-rc4

On Mon, 27 Jul 2009, Gregory Haskins wrote:

> I am not sure when this started, but noticed that sched_getaffinity is
> not working in -rc4.
> 
> [pid  6254] sched_getaffinity(0, 128, 0x7f80586b1fe0) = -1 EINVAL
> (Invalid argument)
> 
> Here is a simple program for reproduction:
> 
> #include <sched.h>
> 
> int main(void)
> {
> 	cpu_set_t mask;
> 	int ret;
> 
> 	ret = sched_getaffinity(0, sizeof(mask), &mask);
> 	if (ret < 0)
> 		perror("getaffinity");
> 
> 	return ret;
> }
> 
> If I get time, I will bisect this later today.
> 

It's most likely due to the cpumask changes.  I don't know what cpu_set_t 
is, but it's probably smaller than CONFIG_NR_CPUS rounded up to a multiple 
of sizeof(long).
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