4.17-stable review patch. If anyone has any objections, please let me know.
------------------ From: Len Brown <[email protected]> commit d9e6dbcf28f383bf08e6a3180972f5722e514a54 upstream. All SKX with stepping higher than 4 support the TSC_DEADLINE, no matter the microcode version. Without this patch, upcoming SKX steppings will not be able to use their TSC_DEADLINE timer. Signed-off-by: Len Brown <[email protected]> Cc: <[email protected]> # v4.14+ Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Fixes: 616dd5872e ("x86/apic: Update TSC_DEADLINE quirk with additional SKX stepping") Link: http://lkml.kernel.org/r/d0c7129e509660be9ec6b233284b8d42d90659e8.1532207856.git.len.br...@intel.com Signed-off-by: Ingo Molnar <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/x86/kernel/apic/apic.c | 3 +++ 1 file changed, 3 insertions(+) --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -573,6 +573,9 @@ static u32 skx_deadline_rev(void) case 0x04: return 0x02000014; } + if (boot_cpu_data.x86_stepping > 4) + return 0; + return ~0U; }
