cleanup: added options for aarch64 alignment trap and DRM force wc

Author: Coreforge

arch/arm64/Kconfig

@@ -1694,6 +1694,14 @@ config ARM64_TAGGED_ADDR_ABI
 	  to system calls as pointer arguments. For details, see
 	  Documentation/arch/arm64/tagged-address-abi.rst.
 
+config ARM64_ALIGNMENT_FIXUPS
+    bool "Fix up misaligned loads and stores from userspace for 64bit code"
+    default n
+    help
+      Userspace may incorrectly assume that certain memory does not need
+      any special alignment considerations, which may result in Bus Erros.
+      Enable to handle these faults in the kernel.
+
 menuconfig COMPAT
 	bool "Kernel support for 32-bit EL0"
 	depends on ARM64_4K_PAGES || EXPERT

arch/arm64/kernel/Makefile

@@ -39,6 +39,7 @@ obj-$(CONFIG_COMPAT)			+= sys32.o signal32.o			\
 					   sys_compat.o
 obj-$(CONFIG_COMPAT)			+= sigreturn32.o
 obj-$(CONFIG_COMPAT_ALIGNMENT_FIXUPS)	+= compat_alignment.o
+obj-$(CONFIG_ARM64_ALIGNMENT_FIXUPS)	+= compat_alignment_64.o
 obj-$(CONFIG_KUSER_HELPERS)		+= kuser32.o
 obj-$(CONFIG_FUNCTION_TRACER)		+= ftrace.o entry-ftrace.o
 obj-$(CONFIG_MODULES)			+= module.o module-plts.o