https://bugs.freedesktop.org/show_bug.cgi?id=82455

--- Comment #32 from charlie <407883775@qq.com> ---
>>radeon: The kernel rejected CS, see dmesg for more information
This error is showed in the drm_ioctl function.The part code show as follow:

468                 if (cmd & IOC_OUT) { //error place,
469                         printk(KERN_EMERG "cmd & IOC_OUT\n");
470                         if (copy_to_user((void __user *)arg, kdata,
471                                          usize) != 0){
472                                 printk(KERN_EMERG "cmd & IOC_OUT error\n");
473                                 retcode = -EFAULT;
474                         }
475                 }

The copy_from_user havn't error, So the error is cause by parameter.
Or, PAGE_SIZE cause it ?

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