powerpc: Fix module building for gcc 4.5 and 64 bit

Gcc 4.5 is now generating out of line register save and restore
in the function prefix and postfix when we use -Os.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index f8779006986d..f6127b9f5aca 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -503,6 +503,11 @@ static int ignore_undef_symbol(struct elf_info *info, const char *symname)
                     strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
                     strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0)
                         return 1;
+        if (info->hdr->e_machine == EM_PPC64)
+                /* Special register function linked on all modules during final link of .ko */
+                if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
+                    strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0)
+                        return 1;
         /* Do not ignore this symbol */
         return 0;
 }