On Fri, May 22, 2026 at 10:44 AM Arnd Bergmann <[email protected]> wrote: > > From: Arnd Bergmann <[email protected]> > > There are multiple levels of functionality of the TSC that are checked > for: built into the kernel, present in the CPU, reliable and probably > more. > > Since the TSC-less CPUs are no longer supported in the kernel, > remove all checks for CONFIG_TSC and X86_FEATURE_TSC and assume > it's always there. Unfortunately the tsc_clocksource_reliable > checks are still required though. > > Signed-off-by: Arnd Bergmann <[email protected]> > --- > Documentation/virt/kvm/x86/timekeeping.rst | 1 - > arch/x86/Kconfig | 1 - > arch/x86/Kconfig.cpu | 1 - > arch/x86/events/msr.c | 5 ---- > arch/x86/include/asm/timex.h | 3 --- > arch/x86/include/asm/trace_clock.h | 8 ------- > arch/x86/include/asm/tsc.h | 13 ---------- > arch/x86/kernel/Makefile | 4 ++-- > arch/x86/kernel/apic/apic.c | 23 +++++++----------- > arch/x86/kernel/apic/io_apic.c | 22 +---------------- > arch/x86/kernel/cpu/centaur.c | 2 -- > arch/x86/kernel/cpu/common.c | 4 +--- > arch/x86/kernel/cpu/proc.c | 15 +++++------- > arch/x86/kernel/i8253.c | 3 --- > arch/x86/kernel/tsc.c | 28 ++-------------------- > arch/x86/lib/kaslr.c | 20 ++++------------ > arch/x86/xen/time.c | 2 -- > drivers/net/ethernet/intel/igc/igc_ptp.c | 4 ++-- > drivers/ptp/Kconfig | 2 +- > tools/power/cpupower/debug/kernel/Makefile | 5 +--- > 20 files changed, 29 insertions(+), 137 deletions(-) > > diff --git a/Documentation/virt/kvm/x86/timekeeping.rst > b/Documentation/virt/kvm/x86/timekeeping.rst > index 21ae7efa29ba..e8519451000d 100644 > --- a/Documentation/virt/kvm/x86/timekeeping.rst > +++ b/Documentation/virt/kvm/x86/timekeeping.rst > @@ -471,7 +471,6 @@ The following feature bits are used by Linux to signal > various TSC attributes, > but they can only be taken to be meaningful for UP or single node systems. > > ========================= ======================================= > -X86_FEATURE_TSC The TSC is available in hardware > X86_FEATURE_RDTSCP The RDTSCP instruction is available > X86_FEATURE_CONSTANT_TSC The TSC rate is unchanged with P-states > X86_FEATURE_NONSTOP_TSC The TSC does not stop in C-states > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index a188ed90b1ca..2fd99a5b4a68 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -683,7 +683,6 @@ config X86_INTEL_QUARK > depends on X86_32 > depends on X86_EXTENDED_PLATFORM > depends on X86_PLATFORM_DEVICES > - depends on X86_TSC > depends on PCI > depends on PCI_GOANY > depends on X86_IO_APIC > diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu > index f4a12b74bed3..fe0246477345 100644 > --- a/arch/x86/Kconfig.cpu > +++ b/arch/x86/Kconfig.cpu > @@ -261,7 +261,6 @@ config X86_USE_PPRO_CHECKSUM > > config X86_TSC > def_bool y > - depends on (MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || > MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX > || M586TSC || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MATOM) || X86_64
Can't you just delete this config option since it's no longer relevant?
