add check_add_overflow() for 6.6.29 drm

diff --git a/sys/dev/pci/drm/include/linux/overflow.h b/sys/dev/pci/drm/include/linux/overflow.h
index 93615be..f417032 100644 (file)
--- a/sys/dev/pci/drm/include/linux/overflow.h
+++ b/sys/dev/pci/drm/include/linux/overflow.h
@@ -8,4 +8,8 @@
 #define struct_size(p, member, n) \
        (sizeof(*(p)) + ((n) * (sizeof(*(p)->member))))
 
+#if defined(__clang__) || (defined(__GNUC__) && __GNUC__ >= 5)
+#define check_add_overflow(x, y, sum)  __builtin_add_overflow(x, y, sum)
+#endif
+
 #endif