[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-0.9.9-384-g8faa1fc

[fche at sourceware dot org]

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- Log -----------------------------------------------------------------
commit 8faa1fc5f98ccb87beb2e71c0ce087278a950dde
Author: Frank Ch. Eigler <fche@elastic.org>
Date:   Fri Sep 18 21:31:06 2009 -0400

    PR10655 part 1: uprobes: track sdt semaphores properly
    
    commit 6846cfc8 introduced an unintended side-effect where semaphore tracking
    was identified with stap_uprobe_specs[] elements, which are normally static/const.
    This kernel patch <http://article.gmane.org/gmane.linux.kernel/854187> catches
    and panics on this.  The cure is to move the variable over to the stap_uprobes[]
    array.
    
    * tapsets.cxx (uprobe emit_module_decls): Add sdt_sem_address to stap_uprobe{} struct,
      to contain per-process relocated semaphore address.
      (emit_module_decls,_init): Remove tsk field, restore constness of appropriate
      locals.  Activate uprobe semaphore right around uprobe activation time.  Remove
      semaphore clearing upon process exit, since by then it's gone.
      (emit_module_exit): Use remembered relocated semaphore address to clean up.
      Fix "-uprobe" DEBUG_UPROBES message.
    * runtime.h: #include <linux/sched.h>.
    * dtrace.in (*_semaphore): Make it an unsigned short - intended 16 bits on all
      common architectures/multilibs.

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

Summary of changes:
 dtrace.in         |    6 ++-
 runtime/runtime.h |    1 +
 tapsets.cxx       |   82 ++++++++++++++++++++++++++++++----------------------
 3 files changed, 52 insertions(+), 37 deletions(-)


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