commit d80d36745e53d211293e358bc124dd68a3c88ba9
Author: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Date:   Fri Oct 3 15:54:36 2008 -0400

    Marker depmod fix core kernel list
    
    * 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?
    >
    > Thanks, regards,
    >
    
    I think the problem comes from this patch :
    commit d35cb360c29956510b2fe1a953bd4968536f7216
    "markers: fix duplicate modpost entry"
    
    Here is a fix that should take care if this problem. Given I am not the
    modpost expert, let's see if I can get an ACK from Sam.
    
    Thanks for the bug report!
    
    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
    CC: Theodore Ts'o <tytso@mit.edu>
    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: Theodore Ts'o <tytso@mit.edu>

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 418cd7d..8e0de6a 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1986,11 +1986,13 @@ static void read_markers(const char *fname)
 
 		mod = find_module(modname);
 		if (!mod) {
-			if (is_vmlinux(modname))
-				have_vmlinux = 1;
 			mod = new_module(NOFAIL(strdup(modname)));
 			mod->skip = 1;
 		}
+		if (is_vmlinux(modname)) {
+			have_vmlinux = 1;
+			mod->skip = 0;
+		}
 
 		if (!mod->skip)
 			add_marker(mod, marker, fmt);