[PATCH] Fix markers duplicate modpost entry

[Mathieu Desnoyers <compudj@krystal.dyndns.org>]

When a kernel was rebuilt, the previous Module.markers was not cleared. It
caused markers with different format strings to appear as duplicates when a
markers was changed.

I merely merged the patches from Roland and Wenji here. It applies to
mainline (and is not intrusive, so will also apply to linux-next).

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
From: Roland McGrath <roland@redhat dot com>
From: Wenji Huang <wenji.huang@oracle.com>
CC: akpm@linux-foundation.org
---
 scripts/Makefile.modpost |    1 +
 scripts/mod/modpost.c    |    3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

Index: linux-2.6-lttng/scripts/Makefile.modpost
===================================================================
--- linux-2.6-lttng.orig/scripts/Makefile.modpost	2008-07-17 02:47:44.000000000 -0400
+++ linux-2.6-lttng/scripts/Makefile.modpost	2008-07-17 02:48:17.000000000 -0400
@@ -101,6 +101,7 @@ quiet_cmd_kernel-mod = MODPOST $@
       cmd_kernel-mod = $(modpost) $@
 
 vmlinux.o: FORCE
+	@rm -fr $(kernelmarkersfile)
 	$(call cmd,kernel-mod)
 
 # Declare generated files as targets for modpost
Index: linux-2.6-lttng/scripts/mod/modpost.c
===================================================================
--- linux-2.6-lttng.orig/scripts/mod/modpost.c	2008-07-17 02:49:33.000000000 -0400
+++ linux-2.6-lttng/scripts/mod/modpost.c	2008-07-17 02:50:10.000000000 -0400
@@ -1992,7 +1992,8 @@ static void read_markers(const char *fna
 			mod->skip = 1;
 		}
 
-		add_marker(mod, marker, fmt);
+		if (!mod->skip)
+			add_marker(mod, marker, fmt);
 	}
 	return;
 fail:

-- 
Mathieu Desnoyers
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