scripts/gdb: handle split debug for vmlinux

This is related to two previous changes.  Commit dfe4529ee4
("scripts/gdb: find vmlinux where it was before") and commit da036ae147
("scripts/gdb: handle split debug").

Although Chrome OS has been using the debug suffix for modules for a
while, it has just recently started using it for vmlinux as well.  That
means we've now got to improve the detection of "vmlinux" to also handle
that it might end with ".debug".

Link: https://lkml.kernel.org/r/20211028151120.v2.1.Ie6bd5a232f770acd8c9ffae487a02170bad3e963@changeid
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/gdb/linux/symbols.py

@@ -148,7 +148,8 @@ lx-symbols command."""
         # drop all current symbols and reload vmlinux
         orig_vmlinux = 'vmlinux'
         for obj in gdb.objfiles():
-            if obj.filename.endswith('vmlinux'):
+            if (obj.filename.endswith('vmlinux') or
+                obj.filename.endswith('vmlinux.debug')):
                 orig_vmlinux = obj.filename
         gdb.execute("symbol-file", to_string=True)
         gdb.execute("symbol-file {0}".format(orig_vmlinux))