tools/power x86_energy_perf_policy: Add make snapshot target

$ make snapshot
creates x86_energy_perf_policy-$(DATE).tar.gz

Which can be transported to a target machine
without needing a kernel tree to build on the target.

Useful for creating debug versions.

Signed-off-by: Len Brown <len.brown@intel.com>

Author: lenb

tools/power/x86/x86_energy_perf_policy/Makefile

@@ -1,8 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0
 CC		= $(CROSS_COMPILE)gcc
-BUILD_OUTPUT    := $(CURDIR)
+BUILD_OUTPUT	:= $(CURDIR)
 PREFIX		:= /usr
 DESTDIR		:=
+DAY		:= $(shell date +%Y.%m.%d)
+SNAPSHOT	= x86_energy_perf_policy-$(DAY)
+
+
 
 ifeq ("$(origin O)", "command line")
 	BUILD_OUTPUT := $(O)
@@ -27,3 +31,26 @@ install : x86_energy_perf_policy
 	install -d  $(DESTDIR)$(PREFIX)/share/man/man8
 	install -m 644 x86_energy_perf_policy.8 $(DESTDIR)$(PREFIX)/share/man/man8
 
+snapshot: x86_energy_perf_policy
+	@rm -rf $(SNAPSHOT)
+	@mkdir $(SNAPSHOT)
+	@cp x86_energy_perf_policy Makefile x86_energy_perf_policy.c x86_energy_perf_policy.8 $(SNAPSHOT)
+
+	@sed -e 's/^#include <linux\/bits.h>/#include "bits.h"/' -e 's/u64/unsigned long long/' ../../../../arch/x86/include/asm/msr-index.h > $(SNAPSHOT)/msr-index.h
+	@echo '#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))' >> $(SNAPSHOT)/msr-index.h
+	@echo "#define BIT(x) (1 << (x))" > $(SNAPSHOT)/bits.h
+	@echo "#define BIT_ULL(nr) (1ULL << (nr))" >> $(SNAPSHOT)/bits.h
+	@echo "#define GENMASK(h, l) (((~0UL) << (l)) & (~0UL >> (sizeof(long) * 8 - 1 - (h))))" >> $(SNAPSHOT)/bits.h
+	@echo "#define GENMASK_ULL(h, l) (((~0ULL) << (l)) & (~0ULL >> (sizeof(long long) * 8 - 1 - (h))))" >> $(SNAPSHOT)/bits.h
+
+	@echo '#define BUILD_BUG_ON(cond) do { enum { compile_time_check ## __COUNTER__ = 1/(!(cond)) }; } while (0)' > $(SNAPSHOT)/build_bug.h
+	@echo '#define __must_be_array(arr) 0' >> $(SNAPSHOT)/build_bug.h
+
+	@echo PWD=. > $(SNAPSHOT)/Makefile
+	@echo "CFLAGS +=	-DMSRHEADER='\"msr-index.h\"'" >> $(SNAPSHOT)/Makefile
+	@echo "CFLAGS +=	-DBUILD_BUG_HEADER='\"build_bug.h\"'" >> $(SNAPSHOT)/Makefile
+	@sed -e's/.*MSRHEADER.*//' Makefile >> $(SNAPSHOT)/Makefile
+
+	@rm -f $(SNAPSHOT).tar.gz
+	tar cvzf $(SNAPSHOT).tar.gz $(SNAPSHOT)
+