On Mon, 28 Sep 2015, Dave Hansen wrote: > From: Dave Hansen <dave.han...@linux.intel.com> > > Previous documentation has referred to these 4 bits as "ignored". > That means that software could have made use of them. But, as > far as I know, the kernel never used them. > > They are still ignored when protection keys is not enabled, so > they could theoretically still get used for software purposes. > > We also implement "empty" versions so that code that references > to them can be optimized away by the compiler when the config > option is not enabled. > > Signed-off-by: Dave Hansen <dave.han...@linux.intel.com>
Reviewed-by: Thomas Gleixner <t...@linutronix.de> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
