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    Subject[PATCHv3 00/16] 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 4-11 are other improvements to PPS subsystem.
    Patches 12-14 add kernel consumer support.
    Patch 15 adds parallel port PPS client.
    Patch 16 adds parallel port PPS generator.

    You can find description for my previous patchset (it describes patches
    12-16 in more detailed) here:

    This patchset is tested against the vanilla 2.6.35 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 12-14, others are ok.

    2John Stultz: the problem is not with logarithmic accumulation because
    it works good if NTP_INTERVAL_FREQ is set to 2.

    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 (16):
    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
    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 +-
    drivers/pps/Kconfig | 10 +
    drivers/pps/Makefile | 2 +-
    drivers/pps/clients/Kconfig | 7 +
    drivers/pps/clients/Makefile | 1 +
    drivers/pps/clients/pps-ktimer.c | 43 ++--
    drivers/pps/clients/pps-ldisc.c | 49 ++--
    drivers/pps/clients/pps_parport.c | 244 +++++++++++++++++
    drivers/pps/generators/Kconfig | 17 ++
    drivers/pps/generators/Makefile | 9 +
    drivers/pps/generators/pps_gen_parport.c | 274 +++++++++++++++++++
    drivers/pps/kapi.c | 330 +++++++++++-------------
    drivers/pps/pps.c | 201 +++++++++++---
    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 | 5 +-
    kernel/time/ntp.c | 421 ++++++++++++++++++++++++++++-
    kernel/time/timekeeping.c | 34 +++
    21 files changed, 1419 insertions(+), 309 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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