diff options
| author | David Woodhouse <dwmw@amazon.co.uk> | 2024-11-02 16:52:17 -0500 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-11-04 18:18:10 -0800 |
| commit | 18ec5491a4959e11ab37438e0b1ff8e3638ceafa (patch) | |
| tree | 543d7498ef9be4da4f57d660f041a0a9ec506b9e | |
| parent | 6a7d68f72797de9ba8a5129975d42994ae27635d (diff) | |
ptp: Remove 'default y' for VMCLOCK PTP device
The VMCLOCK device gives support for accurate timekeeping even across
live migration, unlike the KVM PTP clock. To help ensure that users can
always use ptp_vmclock where it's available in preference to ptp_kvm,
set it to 'default PTP_1588_CLOCK_VMCLOCK' instead of 'default y'.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Link: https://patch.msgid.link/89955b74d225129d6e3d79b53aa8d81d1b50560f.camel@infradead.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | drivers/ptp/Kconfig | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig index 3eac514195af..07bf7f9aae01 100644 --- a/drivers/ptp/Kconfig +++ b/drivers/ptp/Kconfig @@ -135,12 +135,16 @@ config PTP_1588_CLOCK_VMCLOCK tristate "Virtual machine PTP clock" depends on X86_TSC || ARM_ARCH_TIMER depends on PTP_1588_CLOCK && ACPI && ARCH_SUPPORTS_INT128 - default y + default PTP_1588_CLOCK_KVM help This driver adds support for using a virtual precision clock advertised by the hypervisor. This clock is only useful in virtual machines where such a device is present. + Unlike the KVM virtual PTP clock, the VMCLOCK device offers support + for reliable timekeeping even across live migration. So this driver + is enabled by default whenever the KVM PTP clock is. + To compile this driver as a module, choose M here: the module will be called ptp_vmclock. |