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    Subject[PATCHv4 00/17] pps: several fixes and improvements
    This patchset contains several changes that improve an overall
    design/performance of PPS subsystem. I'd like these patches to be
    merged mainline if no one objects.

    Patches 1-3 are bugfixes.
    Patches 4-12 are other improvements to PPS subsystem.
    Patches 13-15 add kernel consumer support.
    Patch 16 adds parallel port PPS client.
    Patch 17 adds parallel port PPS generator.

    You can find description for my previous patchset (it describes patches
    13-17 in more detailed) here:

    This patchset is tested against the vanilla 2.6.36 kernel. But we are
    actually using it on rt-preempt kernel most of the time.
    Those who are interested in other versions of the patchset can find
    them in my git repository:

    There is one problem however: kernel consumer works bad (if enabled)
    when CONFIG_NO_HZ is enabled. The reason for this is commit
    a092ff0f90cae22b2ac8028ecd2c6f6c1a9e4601. Without it hardpps() is able
    to sync to 1us precision in about 10 seconds. With CONFIG_NO_HZ it is
    not syncing at all. This only affects patches 13-15, others are ok.

    v3 -> v4:
    * add patch 12
    * fix memory leak when unregistering pps source
    * don't allow to pass NULL timestamp to dcd_change() to simplify the
    code because this possibility is never used
    * decrease SEND_DELAY_MAX from 300ms to 100us because spending 300ms
    with disabled interrupts is inacceptable while 100us can be
    tolerated in some setups
    * integrate Andrew Morton's patch that replaces create_rt_workqueue()
    with create_workqueue()
    * fix issues pointed out by Vitezslav Samel, Rodolfo Giometti,
    Joe Perches, John Stultz and Andrew Morton:
    * fix possible PPS device freeze due to event counter overflow
    * add a workaround for a possible race in tty code to the pps-ldisc
    module; it replaces a previously used workaround in pps subsystem
    code which was worse because it affected all PPS clients. The
    problem with the current tty code is that it uses mutexes for
    locking, but ldisc reference is taken and used in atomic context
    in uart_handle_dcd_change() so it can't lock mutex and therefore
    is race-prone. This issue should be discussed I think, but this
    patch should be ok for now.
    * override pr_fmt(fmt) to automagically print module names
    * add comments describing struct pps_normtime
    * add arch_gettimeoffset() to raw nanoseconds in
    * use WARN_ON_ONCE instead of WARN_ON in getnstime_raw_and_real()
    * convert SIGNAL_IS_SET macro in pps_parport to inline function
    * add documentation for pps_gen_parport

    v2 -> v3:
    * add patches 1-11
    * add clear_wait parameter to pps_parport
    * add delay parameter to pps_gen_parport
    * fix seqlock unlocking
    * fix issues pointed out by Rodolfo Giometti:
    * move CONFIG_NTP_PPS to drivers/pps/Kconfig
    * swap parport client and generator patches
    * style and typo fixes
    * move patch that adds unified timestamp gathering to be the beginning

    v1 -> v2:
    * fix issues pointed out by John Stultz:
    * style fixes
    * add a about the authorship of the original code
    * replace timespec with pps_normtime struct where timespec is used
    in a wrong way
    * fix seqlock usage in hardpps()
    * unbind kernel consumer on device removal
    * send raw timestamp instead of the last difference to hardpps() which
    simplifies the code and is less error-prone
    * update comments in the kernel consumer code to match the reality
    * split the patch that adds MONOTONIC_RAW timestmaps into two
    * other small fixes

    Alexander Gordeev (17):
    pps: trivial fixes
    pps: declare variables where they are used in switch
    pps: fix race in PPS_FETCH handler
    pps: unify timestamp gathering
    pps: access pps device by direct pointer
    pps: convert printk/pr_* to dev_*
    pps: move idr stuff to pps.c
    pps: add async PPS event handler
    pps: don't disable interrupts when using spin locks
    pps: use BUG_ON for kernel API safety checks
    pps: simplify conditions a bit
    pps: timestamp is always passed to dcd_change()
    ntp: add hardpps implementation
    pps: capture MONOTONIC_RAW timestamps as well
    pps: add kernel consumer support
    pps: add parallel port PPS client
    pps: add parallel port PPS signal generator

    Documentation/ioctl/ioctl-number.txt | 2 +-
    Documentation/pps/pps.txt | 46 ++++
    Documentation/serial/tty.txt | 2 +-
    drivers/pps/Kconfig | 10 +
    drivers/pps/Makefile | 2 +-
    drivers/pps/clients/Kconfig | 7 +
    drivers/pps/clients/Makefile | 1 +
    drivers/pps/clients/pps-ktimer.c | 44 ++--
    drivers/pps/clients/pps-ldisc.c | 70 +++---
    drivers/pps/clients/pps_parport.c | 247 +++++++++++++++++
    drivers/pps/generators/Kconfig | 17 ++
    drivers/pps/generators/Makefile | 9 +
    drivers/pps/generators/pps_gen_parport.c | 275 +++++++++++++++++++
    drivers/pps/kapi.c | 334 +++++++++++------------
    drivers/pps/pps.c | 203 +++++++++++---
    include/linux/pps.h | 7 +
    include/linux/pps_kernel.h | 64 ++++-
    include/linux/serial_core.h | 5 +-
    include/linux/time.h | 2 +
    include/linux/timex.h | 1 +
    include/linux/tty_ldisc.h | 7 +-
    kernel/time/ntp.c | 425 ++++++++++++++++++++++++++++-
    kernel/time/timekeeping.c | 38 +++
    23 files changed, 1502 insertions(+), 316 deletions(-)
    create mode 100644 drivers/pps/clients/pps_parport.c
    create mode 100644 drivers/pps/generators/Kconfig
    create mode 100644 drivers/pps/generators/Makefile
    create mode 100644 drivers/pps/generators/pps_gen_parport.c


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