On Thu, 13 Oct 2016, Grzegorz Andrejczuk wrote:
> Add hwcap2 attribute for x86.
Great value in repeating the subject line. And the subject line is crap
because this patch does way more than adding hwcap2 ....
> Reserve 1st bit of HWCAP2 for exposing Xeon Phi ring 3 monitor/mwait.
> With this userspace apps can detect Ring 3 MONITOR/MWAIT instructions.
User space cannot detect the instructions. User space can check whether the
instructions are enabled.
> +/* Kernel enabled Ring 3 MWAIT for Xeon Phi*/
> +#define HWCAP2_PHIR3MWAIT (1 << 0)
> +/* upto bit 31 free */
Very useful comment, NOT! Stop documenting the obvious.