diff options
| author | Len Brown <len.brown@intel.com> | 2018-07-21 17:19:19 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-06 16:18:20 +0200 |
| commit | 15265c81886bfd975c1408dc88aeb01281b5deae (patch) | |
| tree | c393859df765d35fb439f7bab458022f583e9dda | |
| parent | d17111f7b41fba6f9cd0e3baef1732cae2ca42aa (diff) | |
x86/apic: Future-proof the TSC_DEADLINE quirk for SKX
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.git.len.brown@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/kernel/apic/apic.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 2aabd4cb0e3f..adbda5847b14 100644 --- 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; } |