Kernel v5.14 has various changes to optimize unaligned memory accesses,
e.g. commit 0652035a5794 ("asm-generic: unaligned: remove byteshift helpers").
Those changes break the bootloader on parisc which needs byte-wise
accesses to unaligned memory.
Below is a *** temporary *** patch/hack which fixes those boot problems.
Signed-off-by: Helge Deller <deller@xxxxxx>
---
diff --git a/include/asm-generic/unaligned.h b/include/asm-generic/unaligned.h
index 1c4242416c9f..3ef9a5dd35b5 100644
--- a/include/asm-generic/unaligned.h
+++ b/include/asm-generic/unaligned.h
@@ -9,10 +9,21 @@
#include <linux/unaligned/packed_struct.h>
#include <asm/byteorder.h>
+#if 0
#define __get_unaligned_t(type, ptr) ({ \
const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
__pptr->x; \
})
+#else
+#define __get_unaligned_t(type, ptr) ({ \
+ unsigned char *a = (unsigned char *)(unsigned long)(ptr); \
+ sizeof(type) == 1 ? a[0] : \
+ sizeof(type) == 2 ? a[0] << 8 | a[1] : \
+ sizeof(type) == 3 ? a[0] << 16 | a[1] << 8 | a[2] : \
+ sizeof(type) == 4 ? a[0] << 24 | a[1] << 16 | a[2] << 8 | a[3] : \
+ 0 ; \
+})
+#endif
#define __put_unaligned_t(type, val, ptr) do { \
struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \
