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x86/apic: Future-proof the TSC_DEADLINE quirk for SKX

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commit d9e6dbcf28 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.git.len.brown@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Len Brown
2018-07-21 17:19:19 -04:00
committed by Greg Kroah-Hartman
parent 34a938cd3a
commit 7cf6b325f5
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kernel/apic/apic.c
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@@ -580,6 +580,9 @@ static u32 skx_deadline_rev(void)
case 0x04: return 0x02000014;
}
if (boot_cpu_data.x86_stepping > 4)
return 0;
return ~0U;
}