[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.3-332-gf2b610b

[fche at sourceware dot org]

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- Log -----------------------------------------------------------------
commit f2b610b6295628ae1fef744421c293883f1e4298
Author: Frank Ch. Eigler <fche@elastic.org>
Date:   Sat Nov 27 18:48:52 2010 -0500

    PR10651 / RHBZ653286: mod_timer vs. del_timer_sync races
    
    It appears possible for del_timer_sync (from outside) and mod_timer
    (from within a timer callback) to race.  Defeat this race by ensuring
    that the timer callback checks an atomic_t flag before rescheduling
    itself with mod_timer.
    
    * runtime/transport/relay_v2.c (transport_state): Turn into an atomic_t.
      Update users.
      (__stp_relay_wakeup_timer): Observe flag.
      (_stp_transport_data_fs_{start,stop}): Update flag before timer manipulations.
    * runtime/transport/ring_buffer.c: Ditto for corresponding functions.

-----------------------------------------------------------------------

Summary of changes:
 runtime/transport/relay_v2.c    |   23 +++++++++++++----------
 runtime/transport/ring_buffer.c |   28 +++++++++++++++-------------
 2 files changed, 28 insertions(+), 23 deletions(-)


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systemtap: system-wide probe/trace tool