scripts/decode_stacktrace: Accept dash/underscore in modules

The manpage for modprobe mentions that dashes and underscores are
treated interchangeably in module names.  The stack trace dumps seem to
print module names with underscores.  Use bash to replace _ with the
pattern [-_] so that file names with dashes or underscores can be found.

For example, this line:
[   27.919759]  hda_widget_sysfs_init+0x2b8/0x3a5 [snd_hda_core]

should find a module named snd-hda-core.ko.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Evan Green <[email protected]>
Reviewed-by: Douglas Anderson <[email protected]>
Acked-by: Konstantin Khlebnikov <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Cc: Douglas Anderson <[email protected]>
Cc: Evan Green <[email protected]>
Cc: Nicolas Boichat <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Manuel Traut <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

scripts/decode_stacktrace.sh

@@ -28,7 +28,7 @@ parse_symbol() {
 		local objfile=${modcache[$module]}
 	else
 		[[ $modpath == "" ]] && return
-		local objfile=$(find "$modpath" -name "$module.ko*" -print -quit)
+		local objfile=$(find "$modpath" -name "${module//_/[-_]}.ko*" -print -quit)
 		[[ $objfile == "" ]] && return
 		modcache[$module]=$objfile
 	fi