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Date: Thu, 2 Aug 2007 21:29:36 +0200
From: Roman Divacky <rdivacky@FreeBSD.org>
To: Jung-uk Kim <jkim@FreeBSD.org>
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Cc: perforce@FreeBSD.org
Subject: Re: PERFORCE change 124529 for review
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On Thu, Aug 02, 2007 at 01:56:34PM -0400, Jung-uk Kim wrote:
> On Thursday 02 August 2007 07:30 am, Roman Divacky wrote:
> > +
> > +/* XXX: fake one.. waiting for ssouhlal to commit his patch */
> > +int
> > +linux_sched_getaffinity(struct thread *td, struct
> > linux_sched_getaffinity_args *args) +{
> > +	int error;
> > +	cpumask_t i = ~0;
> > +
> > +	if (args->len < sizeof(cpumask_t))
> > +		return (EINVAL);
> > +
> > +	error = copyout(&i, args->user_mask_ptr, sizeof(cpumask_t));
> > +	return (error);
> > +}
> 
> Er, shouldn't it be more like this?
> 
> int
> linux_sched_getaffinity(struct thread *td,
> 	struct linux_sched_getaffinity_args *args)
> {
> 	uint8_t	*mask;
> 	int	error;
> 
> 	if (args->cpusetsize < sizeof(cpumask_t))
> 		return (EINVAL);
> 
> 	mask = malloc(args->cpusetsize, M_LINUX, M_WAITOK);
> 	memset(mask, 0xff, args->cpusetsize);
> 	error = copyout(mask, args->mask, args->cpusetsize);
> 	free(mask, M_LINUX);
> 
> 	return (error);
> }

hm.. I looked at it and in my version the cpumask_t (linux one) is defined
to be bit array of configurable length. I dont know what is the default but
I think its quite safe to assume that its 128.

but still.. the prototype is:

asmlinkage long sys_sched_getaffinity(pid_t pid, unsigned int len,
                                      unsigned long __user *user_mask_ptr)

and the len is not used anywhere in the code to dynamically size it. I wonder
how to deal with that