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freebsd-dev/sys/kern
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Warner Losh 4f2073fb4c Fix leap second processing by the kernel time keeping routines. 
Before, we would add/subtract the leap second when the system had been
up for an even multiple of days, rather than at the end of the day, as
a leap second is defined (at least wrt ntp).  We do this by
calculating the notion of UTC earlier in the loop, and passing that to
get it adjusted.  Any adjustments that ntp_update_second makes to this
time are then transferred to boot time.  We can't pass it either the
boot time or the uptime because their sum is what determines when a
leap second is needed.  This code adds an extra assignment and two
extra compare in the typical case, which is as cheap as I could made
it.

I have confirmed with this code the kernel time does the correct thing
for both positive and negative leap seconds.  Since the ntp interface
doesn't allow for +2 or -2, those cases can't be tested (and the folks
in the know here say there will never be a +2s or -2s leap event, but
rather two +1s or -1s leap events).

There will very likely be no leap seconds for a while, given how the
earth is speeding up and slowing down, so there will be plenty of time
for this fix to propigate.  UT1-UTC is currently at "about -0.4s" and
decrementing by .1s every 8 months or so.  6 * 8 is 48 months, or 4
years.

-stable has different code, but a similar bug that was introduced
about the time of the last leap second, which is why nobody has
noticed until now.

MFC After: 3 weeks
Reviewed by: phk

"Furthermore, leap seconds must die." -- Cato the Elder
2003-06-25 21:23:51 +00:00
..
bus_if.m Give print_child a default method. 2003-03-25 04:32:52 +00:00
clock_if.m
device_if.m
genassym.sh
imgact_aout.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
imgact_elf32.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
imgact_elf64.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
imgact_elf.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
imgact_gzip.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
imgact_shell.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
inflate.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
init_main.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
init_sysent.c Regen from syscalls.master:1.149, addition of extended attribute 2003-06-04 03:50:20 +00:00
kern_acct.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_acl.c Add a f_vnode field to struct file. 2003-06-22 08:41:43 +00:00
kern_alq.c Add an explicit credential argument to alq_open() to allow the caller to 2003-06-22 22:28:56 +00:00
kern_clock.c Rename P_THREADED to P_SA. P_SA means a process is using scheduler 2003-06-15 00:31:24 +00:00
kern_condvar.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_conf.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_context.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_descrip.c Add a f_vnode field to struct file. 2003-06-22 08:41:43 +00:00
kern_environment.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_event.c Initialize struct fileops with C99 sparse initialization. 2003-06-18 18:16:40 +00:00
kern_exec.c Rename P_THREADED to P_SA. P_SA means a process is using scheduler 2003-06-15 00:31:24 +00:00
kern_exit.c Rename P_THREADED to P_SA. P_SA means a process is using scheduler 2003-06-15 00:31:24 +00:00
kern_fork.c Add a ratelimited message of the form 2003-06-19 05:57:25 +00:00
kern_idle.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_intr.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_jail.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_kse.c cpu_set_upcall_kse needs to access userspace, release schedule lock 2003-06-20 09:12:12 +00:00
kern_kthread.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_ktr.c Add an explicit credential argument to alq_open() to allow the caller to 2003-06-22 22:28:56 +00:00
kern_ktrace.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_linker.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_lock.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_lockf.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_mac.c Redesign the externalization APIs from the MAC Framework to 2003-06-23 01:26:34 +00:00
kern_malloc.c Don't overflow when calculating vm_kmem_size. This fixes kmem_map 2003-06-11 05:18:59 +00:00
kern_mib.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_module.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_mtxpool.c Style(9). 2003-06-13 19:39:21 +00:00
kern_mutex.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_ntptime.c During a positive leap second, the tai_time offset should be 2003-06-25 20:56:40 +00:00
kern_physio.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_poll.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_proc.c Drop the proc lock around SYSCTL_OUT in the no-threads case. 2003-06-17 19:14:00 +00:00
kern_prot.c At this point targp will always be NULL, so remove the useless if. 2003-06-25 13:28:32 +00:00
kern_resource.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_sema.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_shutdown.c Don't overwrite the static panicstr buffer for secondary and further 2003-06-15 11:43:00 +00:00
kern_sig.c When a STOP signal is being sent to a process, it is possible all 2003-06-20 03:36:45 +00:00
kern_subr.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_switch.c Rename P_THREADED to P_SA. P_SA means a process is using scheduler 2003-06-15 00:31:24 +00:00
kern_sx.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_synch.c Rename P_THREADED to P_SA. P_SA means a process is using scheduler 2003-06-15 00:31:24 +00:00
kern_syscalls.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_sysctl.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_tc.c Fix leap second processing by the kernel time keeping routines. 2003-06-25 21:23:51 +00:00
kern_thr.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_thread.c cpu_set_upcall_kse needs to access userspace, release schedule lock 2003-06-20 09:12:12 +00:00
kern_time.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_timeout.c Don't put callout_lock under #ifdef DIAGNOSTIC despite the fact that it 2003-06-20 08:39:04 +00:00
kern_umtx.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_uuid.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_xxx.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
ksched.c Use __FBSDID(). 2003-06-11 06:34:30 +00:00
link_elf_obj.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
link_elf.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
linker_if.m
Make.tags.inc Finish driving a stake through the heart of netns and the associated 2003-03-05 19:24:24 +00:00
Makefile Finish driving a stake through the heart of netns and the associated 2003-03-05 19:24:24 +00:00
makesyscalls.sh - Include umtx.h in files generated by makesyscalls.sh 2003-04-01 01:12:24 +00:00
md4c.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
md5c.c Use le32dec() instead of le32toh() because we are not guaranteed to have 2003-05-05 07:22:35 +00:00
p1003_1b.c Use __FBSDID(). 2003-06-11 06:34:30 +00:00
posix4_mib.c Use __FBSDID(). 2003-06-11 06:34:30 +00:00
sched_4bsd.c Rename P_THREADED to P_SA. P_SA means a process is using scheduler 2003-06-15 00:31:24 +00:00
sched_ule.c - lticks was erroneously being updated in sched_pctcpu(). This was causing 2003-06-21 02:31:49 +00:00
subr_acl_posix1e.c Add a f_vnode field to struct file. 2003-06-22 08:41:43 +00:00
subr_autoconf.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_blist.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_bus.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_clist.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_clock.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_devstat.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_disk.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_eventhandler.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_hints.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_kobj.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_log.c Replace the code for reading and writing the kernel message buffer 2003-06-22 02:18:31 +00:00
subr_mbuf.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_mchain.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_module.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_msgbuf.c Replace the code for reading and writing the kernel message buffer 2003-06-22 02:18:31 +00:00
subr_param.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_pcpu.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_power.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_prf.c When DDB is active, always send printf() output directly to the 2003-06-22 03:20:24 +00:00
subr_prof.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_rman.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_rtc.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_sbuf.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_scanf.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_smp.c Document some sysctl variables. 2003-06-12 19:46:51 +00:00
subr_taskqueue.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_trap.c 1. Add code to support bound thread. when blocked, a bound thread never 2003-06-15 12:51:26 +00:00
subr_turnstile.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_witness.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_xxx.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
sys_generic.c Introduce a new flag on a file descriptor: DFLAG_SEEKABLE and use that 2003-06-18 19:53:59 +00:00
sys_pipe.c Initialize struct fileops with C99 sparse initialization. 2003-06-18 18:16:40 +00:00
sys_process.c Add vm object locking. 2003-06-11 06:43:48 +00:00
sys_socket.c Initialize struct fileops with C99 sparse initialization. 2003-06-18 18:16:40 +00:00
syscalls.c Regen from syscalls.master:1.149, addition of extended attribute 2003-06-04 03:50:20 +00:00
syscalls.master Add system calls to explicitly list extended attributes on a 2003-06-04 03:49:31 +00:00
sysv_ipc.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
sysv_msg.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
sysv_sem.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
sysv_shm.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
tty_compat.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
tty_conf.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
tty_cons.c Use a new message buffer `consmsgbuf' to forward messages to a 2003-06-22 02:54:33 +00:00
tty_pty.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
tty_subr.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
tty_tty.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
tty.c Use a new message buffer `consmsgbuf' to forward messages to a 2003-06-22 02:54:33 +00:00
uipc_accf.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
uipc_cow.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
uipc_domain.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
uipc_jumbo.c Lock the vm object when removing a page. 2003-06-11 21:23:04 +00:00
uipc_mbuf2.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
uipc_mbuf.c Hide the m_defrag* statistics under MBUF_STRESS_TEST, there seems 2003-06-17 02:34:40 +00:00
uipc_proto.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
uipc_sem.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
uipc_sockbuf.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
uipc_socket2.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
uipc_socket.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
uipc_syscalls.c VOP_GETVOBJECT() wants to be called with the vnode lock held. 2003-06-19 03:55:01 +00:00
uipc_usrreq.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
vfs_acl.c Add a f_vnode field to struct file. 2003-06-22 08:41:43 +00:00
vfs_aio.c Add a f_vnode field to struct file. 2003-06-22 08:41:43 +00:00
vfs_bio.c Initialize b_saveaddr when we hand out buffers 2003-06-20 08:26:38 +00:00
vfs_cache.c Make the VFS cache use zones instead of malloc(9). This results in a 2003-06-13 08:46:13 +00:00
vfs_cluster.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
vfs_default.c I have not had any reports of trouble for a long time, so remove the 2003-06-15 19:49:14 +00:00
vfs_export.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
vfs_extattr.c Prefer the vop_rmextattr() vnode operation for removing extended 2003-06-22 23:03:07 +00:00
vfs_init.c Initialize struct vfsops C99-sparsely. 2003-06-12 20:48:38 +00:00
vfs_lookup.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
vfs_mount.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
vfs_subr.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
vfs_syscalls.c Prefer the vop_rmextattr() vnode operation for removing extended 2003-06-22 23:03:07 +00:00
vfs_vnops.c Prefer the vop_rmextattr() vnode operation for removing extended 2003-06-22 23:03:07 +00:00
vnode_if.src Expose vop_rmextattr as an explicit operation at the vnode operation 2003-06-22 22:45:24 +00:00