4.17-stable review patch. If anyone has any objections, please let me know.
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From: Len Brown len.brown@intel.com
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 len.brown@intel.com Cc: stable@kernel.org # v4.14+ Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Peter Zijlstra peterz@infradead.org Cc: Thomas Gleixner tglx@linutronix.de Fixes: 616dd5872e ("x86/apic: Update TSC_DEADLINE quirk with additional SKX stepping") Link: http://lkml.kernel.org/r/d0c7129e509660be9ec6b233284b8d42d90659e8.1532207856... Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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; }