kbuild: soften modpost checks when doing cross builds

The module alias support in the kernel have a consistency
check where it is checked that the size of a structure
in the kernel and on the build host are the same.
For cross builds this check does not make sense so detect
when we do cross builds and silently skip the check in these
situations.
This fixes a build bug for a wireless driver when cross building
for arm.

Acked-by: Michael Buesch <mb@bu3sch.de>
Tested-by: Gordon Farquharson <gordonfarquharson@gmail.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: stable@kernel.org

1 files changed, 4 insertions, 1 deletions

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;