[SCM] systemtap: system-wide probe/trace tool branch, mjw/backtrace, updated. release-1.5-194-g556ca99

[mark@sourceware.org]

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The branch, mjw/backtrace has been updated
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- Log -----------------------------------------------------------------
commit 556ca99181aec9034dcd76072ba85e7d3d5427cc
Author: Mark Wielaard <mjw@redhat.com>
Date:   Tue Jul 26 23:31:01 2011 +0200

    Allow gcc to optimize away uprobe_get_pc() calls in some situations.
    
    If a call is made to the stack-x86.c __stp_stack_print() it might
    try to call uprobe_get_pc(). If this is just a kernel backtrace
    then uprobes might not be loaded. Add a hint by explicitly clearing
    the struct uretprobe_instance *ri variable in that cass in the
    calling function _stp_stack_print() in stack.c, so that gcc
    optimizes away the uprobe_get_pc() call, so that the symbol isn't
    in the module anymore.
    
    Would cause issues like:
    WARNING: "uprobe_get_pc" [stap_d46895_3786.ko] undefined!
    Error inserting module 'stap_d46895_3786.ko': Unknown symbol in module

commit f4eff05f664d737ece23554e9322e1f84cf20c6e
Author: Mark Wielaard <mjw@redhat.com>
Date:   Tue Jul 26 23:29:48 2011 +0200

    Adjust expected "no backtrace" string in context/backtrace.tcl test.
    
    The new generic form is now "<no kernel backtrace at PROBEPOINT>".

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

Summary of changes:
 runtime/stack.c                           |   14 +++++++++-----
 testsuite/systemtap.context/backtrace.tcl |    2 +-
 2 files changed, 10 insertions(+), 6 deletions(-)


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