Initial commit: Linux kernel 4.19 for Unplugged OS

arch/um/scripts/Makefile.rules

@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: GPL-2.0
+# ===========================================================================
+# arch/um: Generic definitions
+# ===========================================================================
+
+USER_SINGLE_OBJS := \
+	$(foreach f,$(patsubst %.o,%,$(obj-y) $(obj-m)),$($(f)-objs))
+USER_OBJS += $(filter %_user.o,$(obj-y) $(obj-m)  $(USER_SINGLE_OBJS))
+USER_OBJS := $(foreach file,$(USER_OBJS),$(obj)/$(file))
+
+$(USER_OBJS:.o=.%): \
+	c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) -include $(srctree)/include/linux/kern_levels.h -include user.h $(CFLAGS_$(basetarget).o)
+
+# These are like USER_OBJS but filter USER_CFLAGS through unprofile instead of
+# using it directly.
+UNPROFILE_OBJS := $(foreach file,$(UNPROFILE_OBJS),$(obj)/$(file))
+
+$(UNPROFILE_OBJS:.o=.%): \
+	c_flags = -Wp,-MD,$(depfile) $(call unprofile,$(USER_CFLAGS)) $(CFLAGS_$(basetarget).o)
+
+$(USER_OBJS) $(UNPROFILE_OBJS): \
+	CHECKFLAGS := $(patsubst $(NOSTDINC_FLAGS),,$(CHECKFLAGS))
+
+# The stubs can't try to call mcount or update basic block data
+define unprofile
+	$(patsubst -pg,,$(patsubst -fprofile-arcs -ftest-coverage,,$(1)))
+endef