#
  # Makefile for the linux kernel.
  #

  obj-y     = fork.o exec_domain.o panic.o \

  	    cpu.o exit.o itimer.o time.o softirq.o resource.o \

  	    sysctl.o sysctl_binary.o capability.o ptrace.o timer.o user.o \

  	    signal.o sys.o kmod.o workqueue.o pid.o task_work.o \

  	    extable.o params.o posix-timers.o \

  	    kthread.o sys_ni.o posix-cpu-timers.o \

  	    hrtimer.o nsproxy.o \

  	    notifier.o ksysfs.o cred.o reboot.o \

  	    async.o range.o groups.o smpboot.o

  ifdef CONFIG_FUNCTION_TRACER

  # Do not trace debug files and internal ftrace files

  CFLAGS_REMOVE_cgroup-debug.o = -pg

  CFLAGS_REMOVE_irq_work.o = -pg

  endif

  # cond_syscall is currently not LTO compatible
  CFLAGS_sys_ni.o = $(DISABLE_LTO)

  obj-y += sched/

  obj-y += locking/

  obj-y += power/

  obj-y += printk/

  obj-y += irq/

  obj-y += rcu/

  obj-$(CONFIG_CHECKPOINT_RESTORE) += kcmp.o

  obj-$(CONFIG_FREEZER) += freezer.o

  obj-$(CONFIG_PROFILING) += profile.o

  obj-$(CONFIG_STACKTRACE) += stacktrace.o

  obj-y += time/

  obj-$(CONFIG_FUTEX) += futex.o

  ifeq ($(CONFIG_COMPAT),y)
  obj-$(CONFIG_FUTEX) += futex_compat.o
  endif

  obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o

  obj-$(CONFIG_SMP) += smp.o

  ifneq ($(CONFIG_SMP),y)

  obj-y += up.o
  endif

  obj-$(CONFIG_UID16) += uid16.o

  obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o

  obj-$(CONFIG_MODULES) += module.o

  obj-$(CONFIG_MODULE_SIG) += module_signing.o

  obj-$(CONFIG_KALLSYMS) += kallsyms.o

  obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o

  obj-$(CONFIG_KEXEC) += kexec.o

  obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o

  obj-$(CONFIG_COMPAT) += compat.o

  obj-$(CONFIG_CGROUPS) += cgroup.o

  obj-$(CONFIG_CGROUP_FREEZER) += cgroup_freezer.o

  obj-$(CONFIG_CPUSETS) += cpuset.o

  obj-$(CONFIG_UTS_NS) += utsname.o
  obj-$(CONFIG_USER_NS) += user_namespace.o

  obj-$(CONFIG_PID_NS) += pid_namespace.o

  obj-$(CONFIG_IKCONFIG) += configs.o

  obj-$(CONFIG_RESOURCE_COUNTERS) += res_counter.o

  obj-$(CONFIG_SMP) += stop_machine.o

  obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o

  obj-$(CONFIG_AUDIT) += audit.o auditfilter.o

  obj-$(CONFIG_AUDITSYSCALL) += auditsc.o

  obj-$(CONFIG_AUDIT_WATCH) += audit_watch.o

  obj-$(CONFIG_AUDIT_TREE) += audit_tree.o

  obj-$(CONFIG_GCOV_KERNEL) += gcov/

  obj-$(CONFIG_KPROBES) += kprobes.o

  obj-$(CONFIG_KGDB) += debug/

  obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o

  obj-$(CONFIG_LOCKUP_DETECTOR) += watchdog.o

  obj-$(CONFIG_SECCOMP) += seccomp.o

  obj-$(CONFIG_RELAY) += relay.o

  obj-$(CONFIG_SYSCTL) += utsname_sysctl.o

  obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o

  obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o

  obj-$(CONFIG_TRACEPOINTS) += tracepoint.o

  obj-$(CONFIG_LATENCYTOP) += latencytop.o

  obj-$(CONFIG_BINFMT_ELF) += elfcore.o
  obj-$(CONFIG_COMPAT_BINFMT_ELF) += elfcore.o
  obj-$(CONFIG_BINFMT_ELF_FDPIC) += elfcore.o

  obj-$(CONFIG_FUNCTION_TRACER) += trace/

  obj-$(CONFIG_TRACING) += trace/

  obj-$(CONFIG_TRACE_CLOCK) += trace/

  obj-$(CONFIG_RING_BUFFER) += trace/

  obj-$(CONFIG_TRACEPOINTS) += trace/

  obj-$(CONFIG_IRQ_WORK) += irq_work.o

  obj-$(CONFIG_CPU_PM) += cpu_pm.o

  
  obj-$(CONFIG_PERF_EVENTS) += events/

  obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o

  obj-$(CONFIG_PADATA) += padata.o

  obj-$(CONFIG_CRASH_DUMP) += crash_dump.o

  obj-$(CONFIG_JUMP_LABEL) += jump_label.o

  obj-$(CONFIG_CONTEXT_TRACKING) += context_tracking.o

  obj-$(CONFIG_TORTURE_TEST) += torture.o

  $(obj)/configs.o: $(obj)/config_data.h
  
  # config_data.h contains the same information as ikconfig.h but gzipped.
  # Info from config_data can be extracted from /proc/config*
  targets += config_data.gz

  $(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE

  	$(call if_changed,gzip)

        filechk_ikconfiggz = (echo "static const char kernel_config_data[] __used = MAGIC_START"; cat $< | scripts/bin2c; echo "MAGIC_END;")

  targets += config_data.h
  $(obj)/config_data.h: $(obj)/config_data.gz FORCE

  	$(call filechk,ikconfiggz)

  
  $(obj)/time.o: $(obj)/timeconst.h

  quiet_cmd_hzfile = HZFILE  $@
        cmd_hzfile = echo "hz=$(CONFIG_HZ)" > $@
  
  targets += hz.bc
  $(obj)/hz.bc: $(objtree)/include/config/hz.h FORCE
  	$(call if_changed,hzfile)
  
  quiet_cmd_bc  = BC      $@
        cmd_bc  = bc -q $(filter-out FORCE,$^) > $@

  targets += timeconst.h

  $(obj)/timeconst.h: $(obj)/hz.bc $(src)/timeconst.bc FORCE
  	$(call if_changed,bc)

  ###############################################################################

  #

  # Roll all the X.509 certificates that we can find together and pull them into

  # the kernel so that they get loaded into the system trusted keyring during
  # boot.

  #

  # We look in the source root and the build root for all files whose name ends
  # in ".x509".  Unfortunately, this will generate duplicate filenames, so we
  # have make canonicalise the pathnames and then sort them to discard the
  # duplicates.

  #

  ###############################################################################

  ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y)

  X509_CERTIFICATES-y := $(wildcard *.x509) $(wildcard $(srctree)/*.x509)

  X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += $(objtree)/signing_key.x509
  X509_CERTIFICATES-raw := $(sort $(foreach CERT,$(X509_CERTIFICATES-y), \

  				$(or $(realpath $(CERT)),$(CERT))))

  X509_CERTIFICATES := $(subst $(realpath $(objtree))/,,$(X509_CERTIFICATES-raw))

  
  ifeq ($(X509_CERTIFICATES),)
  $(warning *** No X.509 certificates found ***)
  endif
  
  ifneq ($(wildcard $(obj)/.x509.list),)
  ifneq ($(shell cat $(obj)/.x509.list),$(X509_CERTIFICATES))
  $(info X.509 certificate list changed)
  $(shell rm $(obj)/.x509.list)
  endif
  endif

  kernel/system_certificates.o: $(obj)/x509_certificate_list

  quiet_cmd_x509certs  = CERTS   $@

        cmd_x509certs  = cat $(X509_CERTIFICATES) /dev/null >$@ $(foreach X509,$(X509_CERTIFICATES),; echo "  - Including cert $(X509)")

  targets += $(obj)/x509_certificate_list
  $(obj)/x509_certificate_list: $(X509_CERTIFICATES) $(obj)/.x509.list
  	$(call if_changed,x509certs)

  targets += $(obj)/.x509.list
  $(obj)/.x509.list:
  	@echo $(X509_CERTIFICATES) >$@

  endif

  clean-files := x509_certificate_list .x509.list

  ifeq ($(CONFIG_MODULE_SIG),y)

  ###############################################################################
  #
  # If module signing is requested, say by allyesconfig, but a key has not been
  # supplied, then one will need to be generated to make sure the build does not
  # fail and that the kernel may be used afterwards.
  #
  ###############################################################################

  ifndef CONFIG_MODULE_SIG_HASH

  $(error Could not determine digest type to use from kernel config)
  endif

  signing_key.priv signing_key.x509: x509.genkey
  	@echo "###"
  	@echo "### Now generating an X.509 key pair to be used for signing modules."
  	@echo "###"
  	@echo "### If this takes a long time, you might wish to run rngd in the"
  	@echo "### background to keep the supply of entropy topped up.  It"

  	@echo "### needs to be run as root, and uses a hardware random"
  	@echo "### number generator if one is available."

  	@echo "###"

  	openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
  		-batch -x509 -config x509.genkey \

  		-outform DER -out signing_key.x509 \

  		-keyout signing_key.priv 2>&1

  	@echo "###"
  	@echo "### Key pair generated."
  	@echo "###"
  
  x509.genkey:
  	@echo Generating X.509 key generation config
  	@echo  >x509.genkey "[ req ]"
  	@echo >>x509.genkey "default_bits = 4096"
  	@echo >>x509.genkey "distinguished_name = req_distinguished_name"
  	@echo >>x509.genkey "prompt = no"

  	@echo >>x509.genkey "string_mask = utf8only"

  	@echo >>x509.genkey "x509_extensions = myexts"
  	@echo >>x509.genkey
  	@echo >>x509.genkey "[ req_distinguished_name ]"
  	@echo >>x509.genkey "O = Magrathea"
  	@echo >>x509.genkey "CN = Glacier signing key"
  	@echo >>x509.genkey "emailAddress = slartibartfast@magrathea.h2g2"
  	@echo >>x509.genkey
  	@echo >>x509.genkey "[ myexts ]"
  	@echo >>x509.genkey "basicConstraints=critical,CA:FALSE"
  	@echo >>x509.genkey "keyUsage=digitalSignature"
  	@echo >>x509.genkey "subjectKeyIdentifier=hash"
  	@echo >>x509.genkey "authorityKeyIdentifier=keyid"
  endif