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SubjectRe: [patch 3/4] timerfd: Implement timerfd_ioctl method to restore timerfd_ctx::ticks
On Wed, Jul 02, 2014 at 12:49:51PM -0400, Christopher Covington wrote:
> >
> > +#ifdef CONFIG_CHECKPOINT_RESTORE
> > +static long timerfd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> > +{
> > + struct timerfd_ctx *ctx = file->private_data;
> > + int ret = 0;
> > +
> > + switch (cmd) {
> > + case TFD_IOC_SET_TICKS: {
> > + u64 ticks;
> > +
> > + if (get_user(ticks, (u64 __user *)arg))
>
> 64-bit get_user is currently unsupported on ARM, although it appears work is
> ongoing [1].
>
> 1. https://lkml.org/lkml/2014/6/17/260

Thanks for info, Christopher! What arm camp is using then, copy-from-user?


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