[Bug 259036] Add PPS_SYNC to GENERIC kernel configuration

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259036

--- Comment #2 from Konstantin Belousov <kib@FreeBSD.org> ---
I will commit the following after tinderbox finishes.

commit 3822304620c392fbef3e7bee197bf1f3b0860aed
Author: Konstantin Belousov <kib@FreeBSD.org>
Date:   Sun Oct 10 15:20:45 2021 +0300

    Enable PPS_SYNC on amd64, arm64 and armv7.

    Remove the option from NOTES/LINT.

    PR:     259036
    Requested by:   John Hay <john@sanren.ac.za>
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week

diff --git a/sys/amd64/conf/GENERIC b/sys/amd64/conf/GENERIC
index 40c14e90aef0..f47b995beb2c 100644
--- a/sys/amd64/conf/GENERIC
+++ b/sys/amd64/conf/GENERIC
@@ -138,6 +138,12 @@ options            PCI_IOV                 # PCI SR-IOV
support

 options        COMPAT_LINUXKPI

+# Enable support for the kernel PLL to use an external PPS signal,
+# under supervision of [x]ntpd(8)
+# More info in ntpd documentation: http://www.eecis.udel.edu/~ntp
+
+options        PPS_SYNC
+
 # Floppy drives
 device         fdc

diff --git a/sys/arm/conf/std.armv7 b/sys/arm/conf/std.armv7
index 2d1dfa135780..fda291df289a 100644
--- a/sys/arm/conf/std.armv7
+++ b/sys/arm/conf/std.armv7
@@ -84,3 +84,9 @@ options       VERBOSE_SYSINIT=0       # Support
debug.verbose_sysinit, off by default
 #options       KTR_VERBOSE=0
 #options       USB_REQ_DEBUG
 #options       USB_VERBOSE
+
+# Enable support for the kernel PLL to use an external PPS signal,
+# under supervision of [x]ntpd(8)
+# More info in ntpd documentation: http://www.eecis.udel.edu/~ntp
+
+options        PPS_SYNC
diff --git a/sys/arm64/conf/std.arm64 b/sys/arm64/conf/std.arm64
index 8460d449939d..5c26f19b4299 100644
--- a/sys/arm64/conf/std.arm64
+++ b/sys/arm64/conf/std.arm64
@@ -96,3 +96,9 @@ options       NETDUMP                 # netdump(4) client
support

 # Make an SMP-capable kernel by default
 options        SMP                     # Symmetric MultiProcessor Kernel
+
+# Enable support for the kernel PLL to use an external PPS signal,
+# under supervision of [x]ntpd(8)
+# More info in ntpd documentation: http://www.eecis.udel.edu/~ntp
+
+options        PPS_SYNC
diff --git a/sys/conf/NOTES b/sys/conf/NOTES
index 39446fba06b3..e41b00edf2f6 100644
--- a/sys/conf/NOTES
+++ b/sys/conf/NOTES
@@ -1245,12 +1245,6 @@ options  CAPABILITY_MODE # sandboxes with no global
namespace access

 options        HZ=100

-# Enable support for the kernel PLL to use an external PPS signal,
-# under supervision of [x]ntpd(8)
-# More info in ntpd documentation: http://www.eecis.udel.edu/~ntp
-
-options        PPS_SYNC
-
 # Enable support for generic feed-forward clocks in the kernel.
 # The feed-forward clock support is an alternative to the feedback oriented
 # ntpd/system clock approach, and is to be used with a feed-forward

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