Restore cpu_up as EXPORT_SYMBOL_GPL fix2

Closes #15 Remove kernel patch changing cpu_up to EXPORT_SYMBOL
Update README in patches/linux-4.19-cs for change
Remove symbols from patched kernel in src/drv/ExtraSymbols.symvers
Add parameter in GNUmakefile to build will reference Module.symvers from kernel

patches/linux-4.19-cs/README

@@ -4,7 +4,7 @@ linux kernel 4.19 for CDS real-time.  Both the patch and config file are needed
 
 - For LIGO CDS, use the final -cs files (not -aei-cs)   
 
-- Basic CDS patch - adds CPU Shutdown, cpu_up EXPORT_SYMBOL
+- Basic CDS patch - adds CPU Shutdown only
 kernel-4.19-cs.patch
 
 - Custom kernel config file for Gentoo at AEI - creates monolithic kernel with a minimum of drivers

patches/linux-4.19-cs/linux-4.19-cs.patch

-diff -r -u -d linux-source-4.19.orig/arch/x86/kernel/smpboot.c linux-source-4.19.cs/arch/x86/kernel/smpboot.c
---- linux-source-4.19.orig/arch/x86/kernel/smpboot.c	2019-04-27 02:36:41.000000000 -0500
-+++ linux-source-4.19.cs/arch/x86/kernel/smpboot.c	2019-09-04 10:44:14.997185804 -0500
+diff -Naur linux-source-4.19.orig/arch/x86/kernel/smpboot.c linux-source-4.19.cs/arch/x86/kernel/smpboot.c
+--- linux-source-4.19.orig/arch/x86/kernel/smpboot.c	2019-08-16 03:12:54.000000000 -0500
++++ linux-source-4.19.cs/arch/x86/kernel/smpboot.c	2019-12-02 15:39:56.407306004 -0600
 @@ -1559,6 +1559,18 @@
  	common_cpu_die(cpu);
  }
@@ -31,15 +31,3 @@ diff -r -u -d linux-source-4.19.orig/arch/x86/kernel/smpboot.c linux-source-4.19
  }
  
  static bool wakeup_cpu0(void)
-diff -r -u -d linux-source-4.19.orig/kernel/cpu.c linux-source-4.19.cs/kernel/cpu.c
---- linux-source-4.19.orig/kernel/cpu.c	2019-08-07 21:02:38.000000000 -0500
-+++ linux-source-4.19.cs/kernel/cpu.c	2019-09-04 10:44:14.997185804 -0500
-@@ -1160,7 +1160,7 @@
- {
- 	return do_cpu_up(cpu, CPUHP_ONLINE);
- }
--EXPORT_SYMBOL_GPL(cpu_up);
-+EXPORT_SYMBOL(cpu_up);
- 
- #ifdef CONFIG_PM_SLEEP_SMP
- static cpumask_var_t frozen_cpus;

src/drv/ExtraSymbols.symvers

@@ -16,9 +16,5 @@
 0x00000000	sci_unexport_segment	/	EXPORT_SYMBOL
 0x00000000	sci_disconnect_segment	/	EXPORT_SYMBOL
 0x00000000	sci_unmap_segment	/	EXPORT_SYMBOL
-0x00000000	cpu_up	/	EXPORT_SYMBOL
-0x00000000	printkl	/	EXPORT_SYMBOL
-0x00000000	set_fe_code_idle	/	EXPORT_SYMBOL
-0x00000000	is_cpu_taken_by_rcg_model	/	EXPORT_SYMBOL
 0x00000000	vprintkl	/	EXPORT_SYMBOL
 0x00000000	ligo_get_gps_driver_offset	/	EXPORT_SYMBOL

src/epics/util/GNUmakefile

@@ -4,7 +4,7 @@ PWD := $(shell pwd)
 KDIR := /lib/modules/$(shell uname -r)/build
 #include "Makefile"
 default:
-	$(MAKE) -C $(KDIR) SUBDIRS=$(shell pwd) modules
+	$(MAKE) -C $(KDIR) SUBDIRS=$(shell pwd) M=$(PWD) modules
 clean:
 	rm -f *.o *.ko Module.symvers *.mod.c .*.cmd $(MODULENAME)_test