Intel allows BIOS or the OS to enable or disable some CPU fueatures via IA32_MISC_ENABLE. I have machines that don't enable fast strings or monitor/mwait in BIOS, so do it on bootup instead. The Intel SDM volume 3, appendix B.1 says that the OS should not touch the monitor enable bit if SSE3 is not present, which presumably means that the OS may touch that bit if SSE3 is present. In any case, these patches seem to work. Changes from v2: - Don't linebreak printk messages (for ease of grepping) - Use printk_once - Update the "Disabled fast string operations" message Changes from v1: - Display FW_WARN messages. - Don't change the kmemcheck message. - Improve the fast string comment. - Improve the changelogs. Andy Lutomirski (2): x86: Enable fast strings on Intel if BIOS hasn't already x86: Enable monitor/mwait on Intel if BIOS hasn't already arch/x86/kernel/cpu/intel.c | 52 ++++++++++++++++++++++++++++++++++++++---- 1 files changed, 47 insertions(+), 5 deletions(-) -- 1.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
