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    • Linus Torvalds's avatar
      Linux 2.6.27-rc9 · 4330ed8e
      Linus Torvalds authored
      4330ed8e
    • Mathieu Desnoyers's avatar
      Marker depmod fix core kernel list · 87f3b6b6
      Mathieu Desnoyers authored
      * Theodore Ts'o (tytso@mit.edu) wrote:
      >
      > I've been playing with adding some markers into ext4 to see if they
      > could be useful in solving some problems along with Systemtap.  It
      > appears, though, that as of 2.6.27-rc8, markers defined in code which is
      > compiled directly into the kernel (i.e., not as modules) don't show up
      > in Module.markers:
      >
      > kvm_trace_entryexit arch/x86/kvm/kvm-intel  %u %p %u %u %u %u %u %u
      > kvm_trace_handler arch/x86/kvm/kvm-intel  %u %p %u %u %u %u %u %u
      > kvm_trace_entryexit arch/x86/kvm/kvm-amd  %u %p %u %u %u %u %u %u
      > kvm_trace_handler arch/x86/kvm/kvm-amd  %u %p %u %u %u %u %u %u
      >
      > (Note the lack of any of the kernel_sched_* markers, and the markers I
      > added for ext4_* and jbd2_* are missing as wel.)
      >
      > Systemtap apparently depends on in-kernel trace_mark being recorded in
      > Module.markers, and apparently it's been claimed that it used to be
      > there.  Is this a bug in systemtap, or in how Module.markers is getting
      > built?   And is there a file that contains the equivalent information
      > for markers located in non-modules code?
      
      I think the problem comes from "markers: fix duplicate modpost entry"
      (commit d35cb360)
      
      Especially :
      
        -   add_marker(mod, marker, fmt);
        +   if (!mod->skip)
        +     add_marker(mod, marker, fmt);
          }
          return;
         fail:
      
      Here is a fix that should take care if this problem.
      
      Thanks for the bug report!
      Signed-off-by: default avatarMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
      Tested-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      CC: Greg KH <greg@kroah.com>
      CC: David Smith <dsmith@redhat.com>
      CC: Roland McGrath <roland@redhat.com>
      CC: Sam Ravnborg <sam@ravnborg.org>
      CC: Wenji Huang <wenji.huang@oracle.com>
      CC: Takashi Nishiie <t-nishiie@np.css.fujitsu.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      87f3b6b6