ARM patch for kernel module builds referencing cross compiled kernel headers (https://github.com/igorpecovnik/lib/blob/next/patch/headers-debian-byteshift.patch)

headers-debian-byteshift.patch

Signed-off-by: Matt Fleming <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: H. Peter Anvin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

---
tools/include/tools/be_byteshift.h | 70 +++++++++++++++++++++++++++++++++++++
tools/include/tools/le_byteshift.h | 70 +++++++++++++++++++++++++++++++++++++
2 files changed, 140 insertions(+)

--- /dev/null
+++ b/tools/include/tools/be_byteshift.h
@@ -0,0 +1,70 @@
+#ifndef _TOOLS_BE_BYTESHIFT_H
+#define _TOOLS_BE_BYTESHIFT_H
+
+#include <linux/types.h>
+
+static inline __u16 __get_unaligned_be16(const __u8 *p)
+{
+ return p[0] << 8 | p[1];
+}
+
+static inline __u32 __get_unaligned_be32(const __u8 *p)
+{
+ return p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
+}
+
+static inline __u64 __get_unaligned_be64(const __u8 *p)
+{
+ return (__u64)__get_unaligned_be32(p) << 32 |
+ __get_unaligned_be32(p + 4);
+}
+
+static inline void __put_unaligned_be16(__u16 val, __u8 *p)
+{
+ *p++ = val >> 8;
+ *p++ = val;
+}
+
+static inline void __put_unaligned_be32(__u32 val, __u8 *p)
+{
+ __put_unaligned_be16(val >> 16, p);
+ __put_unaligned_be16(val, p + 2);
+}
+
+static inline void __put_unaligned_be64(__u64 val, __u8 *p)
+{
+ __put_unaligned_be32(val >> 32, p);
+ __put_unaligned_be32(val, p + 4);
+}
+
+static inline __u16 get_unaligned_be16(const void *p)
+{
+ return __get_unaligned_be16((const __u8 *)p);
+}
+
+static inline __u32 get_unaligned_be32(const void *p)
+{
+ return __get_unaligned_be32((const __u8 *)p);
+}
+
+static inline __u64 get_unaligned_be64(const void *p)
+{
+ return __get_unaligned_be64((const __u8 *)p);
+}
+
+static inline void put_unaligned_be16(__u16 val, void *p)
+{
+ __put_unaligned_be16(val, p);
+}
+
+static inline void put_unaligned_be32(__u32 val, void *p)
+{
+ __put_unaligned_be32(val, p);
+}
+
+static inline void put_unaligned_be64(__u64 val, void *p)
+{
+ __put_unaligned_be64(val, p);
+}
+
+#endif /* _TOOLS_BE_BYTESHIFT_H */
--- /dev/null
+++ b/tools/include/tools/le_byteshift.h
@@ -0,0 +1,70 @@
+#ifndef _TOOLS_LE_BYTESHIFT_H
+#define _TOOLS_LE_BYTESHIFT_H
+
+#include <linux/types.h>
+
+static inline __u16 __get_unaligned_le16(const __u8 *p)
+{
+ return p[0] | p[1] << 8;
+}
+
+static inline __u32 __get_unaligned_le32(const __u8 *p)
+{
+ return p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24;
+}
+
+static inline __u64 __get_unaligned_le64(const __u8 *p)
+{
+ return (__u64)__get_unaligned_le32(p + 4) << 32 |
+ __get_unaligned_le32(p);
+}
+
+static inline void __put_unaligned_le16(__u16 val, __u8 *p)
+{
+ *p++ = val;
+ *p++ = val >> 8;
+}
+
+static inline void __put_unaligned_le32(__u32 val, __u8 *p)
+{
+ __put_unaligned_le16(val >> 16, p + 2);
+ __put_unaligned_le16(val, p);
+}
+
+static inline void __put_unaligned_le64(__u64 val, __u8 *p)
+{
+ __put_unaligned_le32(val >> 32, p + 4);
+ __put_unaligned_le32(val, p);
+}
+
+static inline __u16 get_unaligned_le16(const void *p)
+{
+ return __get_unaligned_le16((const __u8 *)p);
+}
+
+static inline __u32 get_unaligned_le32(const void *p)
+{
+ return __get_unaligned_le32((const __u8 *)p);
+}
+
+static inline __u64 get_unaligned_le64(const void *p)
+{
+ return __get_unaligned_le64((const __u8 *)p);
+}
+
+static inline void put_unaligned_le16(__u16 val, void *p)
+{
+ __put_unaligned_le16(val, p);
+}
+
+static inline void put_unaligned_le32(__u32 val, void *p)
+{
+ __put_unaligned_le32(val, p);
+}
+
+static inline void put_unaligned_le64(__u64 val, void *p)
+{
+ __put_unaligned_le64(val, p);
+}
+
+#endif /* _TOOLS_LE_BYTESHIFT_H */

As referenced here: https://github.com/machinekit/machinekit-dkms/blob/master/README.md

If this fix fails with an error message like here, so something like:

  HOSTCC  scripts/sortextable
scripts/sortextable.c:31:32: fatal error: tools/be_byteshift.h: No such file or directory
 #include <tools/be_byteshift.h>
                                ^
compilation terminated.
scripts/Makefile.host:91: recipe for target 'scripts/sortextable' failed
make[1]: *** [scripts/sortextable] Error 1
Makefile:555: recipe for target 'scripts' failed
make: *** [scripts] Error 2
a patch over the kernel headers is needed:

wget https://raw.githubusercontent.com/igorpecovnik/lib/next/patch/headers-debian-byteshift.patch
patch -p1 < headers-debian-byteshift.patch
make scripts
After this building out-of-tree modules should work even with cross-built kernels.