5 files changed, 15 insertions, 3 deletions

diff --git a/Makefile b/Makefile
index 7a4d34b91e03..1c4c8f87f6c5 100644
--- a/Makefile
+++ b/Makefile
@@ -189,7 +189,7 @@ SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
 # Alternatively CROSS_COMPILE can be set in the environment.
 # Default value for CROSS_COMPILE is not to prefix executables
 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
-
+export KBUILD_BUILDHOST := $(SUBARCH)
 ARCH            ?= $(SUBARCH)
 CROSS_COMPILE   ?=
 
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index cfc004e04417..2d20640854b7 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -58,6 +58,9 @@ modules   := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o)))
 # Stop after building .o files if NOFINAL is set. Makes compile tests quicker
 _modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules))
 
+ifneq ($(KBUILD_BUILDHOST),$(ARCH))
+        cross_build := 1
+endif
 
 # Step 2), invoke modpost
 #  Includes step 3,4
@@ -70,7 +73,8 @@ modpost = scripts/mod/modpost                    \
  $(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S)      \
  $(if $(CONFIG_MARKERS),-K $(kernelmarkersfile)) \
  $(if $(CONFIG_MARKERS),-M $(markersfile))       \
- $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w)
+ $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w) \
+ $(if $(cross_build),-c)
 
 quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules
       cmd_modpost = $(modpost) -s
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index 9ddf944cce29..348d8687b7c9 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -51,11 +51,13 @@ do {                                                            \
                 sprintf(str + strlen(str), "*");                \
 } while(0)
 
+unsigned int cross_build = 0;
 /**
  * Check that sizeof(device_id type) are consistent with size of section
  * in .o file. If in-consistent then userspace and kernel does not agree
  * on actual size which is a bug.
  * Also verify that the final entry in the table is all zeros.
+ * Ignore both checks if build host differ from target host and size differs.
  **/
 static void device_id_check(const char *modname, const char *device_id,
                             unsigned long size, unsigned long id_size,
@@ -64,6 +66,8 @@ static void device_id_check(const char *modname, const char *device_id,
         int i;
 
         if (size % id_size || size < id_size) {
+                if (cross_build != 0)
+                        return;
                 fatal("%s: sizeof(struct %s_device_id)=%lu is not a modulo "
                       "of the size of section __mod_%s_device_table=%lu.\n"
                       "Fix definition of struct %s_device_id "
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 695b5d657cf5..110cf243fa4e 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -2026,7 +2026,7 @@ int main(int argc, char **argv)
         int opt;
         int err;
 
-        while ((opt = getopt(argc, argv, "i:I:msSo:awM:K:")) != -1) {
+        while ((opt = getopt(argc, argv, "i:I:cmsSo:awM:K:")) != -1) {
                 switch (opt) {
                 case 'i':
                         kernel_read = optarg;
@@ -2035,6 +2035,9 @@ int main(int argc, char **argv)
                         module_read = optarg;
                         external_module = 1;
                         break;
+                case 'c':
+                        cross_build = 1;
+                        break;
                 case 'm':
                         modversions = 1;
                         break;
diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h
index 565c5872407e..09f58e33d227 100644
--- a/scripts/mod/modpost.h
+++ b/scripts/mod/modpost.h
@@ -135,6 +135,7 @@ struct elf_info {
 };
 
 /* file2alias.c */
+extern unsigned int cross_build;
 void handle_moddevtable(struct module *mod, struct elf_info *info,
                         Elf_Sym *sym, const char *symname);
 void add_moddevtable(struct buffer *buf, struct module *mod);