kernel/Makefile - linux - Git at Google

 #
 # 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 \
 	    rcupdate.o extable.o params.o posix-timers.o \
 	    kthread.o wait.o sys_ni.o posix-cpu-timers.o mutex.o \
 	    hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
 	    notifier.o ksysfs.o cred.o reboot.o \
 	    async.o range.o groups.o lglock.o smpboot.o

 ifdef CONFIG_FUNCTION_TRACER
 # Do not trace debug files and internal ftrace files
 CFLAGS_REMOVE_lockdep.o = -pg
 CFLAGS_REMOVE_lockdep_proc.o = -pg
 CFLAGS_REMOVE_mutex-debug.o = -pg
 CFLAGS_REMOVE_rtmutex-debug.o = -pg
 CFLAGS_REMOVE_cgroup-debug.o = -pg
 CFLAGS_REMOVE_irq_work.o = -pg
 endif

 obj-y += sched/
 obj-y += power/
 obj-y += printk/
 obj-y += cpu/
 obj-y += irq/

 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-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o
 obj-$(CONFIG_LOCKDEP) += lockdep.o
 ifeq ($(CONFIG_PROC_FS),y)
 obj-$(CONFIG_LOCKDEP) += lockdep_proc.o
 endif
 obj-$(CONFIG_FUTEX) += futex.o
 ifeq ($(CONFIG_COMPAT),y)
 obj-$(CONFIG_FUTEX) += futex_compat.o
 endif
 obj-$(CONFIG_RT_MUTEXES) += rtmutex.o
 obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o
 obj-$(CONFIG_RT_MUTEX_TESTER) += rtmutex-tester.o
 obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
 obj-$(CONFIG_SMP) += smp.o
 ifneq ($(CONFIG_SMP),y)
 obj-y += up.o
 endif
 obj-$(CONFIG_SMP) += spinlock.o
 obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o
 obj-$(CONFIG_PROVE_LOCKING) += spinlock.o
 obj-$(CONFIG_UID16) += uid16.o
 obj-$(CONFIG_MODULES) += module.o
 obj-$(CONFIG_MODULE_SIG) += module_signing.o modsign_pubkey.o modsign_certificate.o
 obj-$(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-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
 obj-$(CONFIG_TREE_RCU) += rcutree.o
 obj-$(CONFIG_TREE_PREEMPT_RCU) += rcutree.o
 obj-$(CONFIG_TREE_RCU_TRACE) += rcutree_trace.o
 obj-$(CONFIG_TINY_RCU) += rcutiny.o
 obj-$(CONFIG_TINY_PREEMPT_RCU) += rcutiny.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)/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)

 ifeq ($(CONFIG_MODULE_SIG),y)
 ###############################################################################
 #
 # Roll all the X.509 certificates that we can find together and pull them into
 # the kernel.
 #
 # 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.
 #
 ###############################################################################
 X509_CERTIFICATES-y := $(wildcard *.x509) $(wildcard $(srctree)/*.x509)
 X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += signing_key.x509
 X509_CERTIFICATES := $(sort $(foreach CERT,$(X509_CERTIFICATES-y), \
 				$(or $(realpath $(CERT)),$(CERT))))

 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/modsign_certificate.o: $(obj)/x509_certificate_list

 quiet_cmd_x509certs  = CERTS   $@
       cmd_x509certs  = cat $(X509_CERTIFICATES) /dev/null >$@
 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 $(X509_CERTIFICATES) >$@

 clean-files := x509_certificate_list .x509.list

 ###############################################################################
 #
 # 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
	#
	# 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 \
	rcupdate.o extable.o params.o posix-timers.o \
	kthread.o wait.o sys_ni.o posix-cpu-timers.o mutex.o \
	hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
	notifier.o ksysfs.o cred.o reboot.o \
	async.o range.o groups.o lglock.o smpboot.o

	ifdef CONFIG_FUNCTION_TRACER
	# Do not trace debug files and internal ftrace files
	CFLAGS_REMOVE_lockdep.o = -pg
	CFLAGS_REMOVE_lockdep_proc.o = -pg
	CFLAGS_REMOVE_mutex-debug.o = -pg
	CFLAGS_REMOVE_rtmutex-debug.o = -pg
	CFLAGS_REMOVE_cgroup-debug.o = -pg
	CFLAGS_REMOVE_irq_work.o = -pg
	endif

	obj-y += sched/
	obj-y += power/
	obj-y += printk/
	obj-y += cpu/
	obj-y += irq/

	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-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o
	obj-$(CONFIG_LOCKDEP) += lockdep.o
	ifeq ($(CONFIG_PROC_FS),y)
	obj-$(CONFIG_LOCKDEP) += lockdep_proc.o
	endif
	obj-$(CONFIG_FUTEX) += futex.o
	ifeq ($(CONFIG_COMPAT),y)
	obj-$(CONFIG_FUTEX) += futex_compat.o
	endif
	obj-$(CONFIG_RT_MUTEXES) += rtmutex.o
	obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o
	obj-$(CONFIG_RT_MUTEX_TESTER) += rtmutex-tester.o
	obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
	obj-$(CONFIG_SMP) += smp.o
	ifneq ($(CONFIG_SMP),y)
	obj-y += up.o
	endif
	obj-$(CONFIG_SMP) += spinlock.o
	obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o
	obj-$(CONFIG_PROVE_LOCKING) += spinlock.o
	obj-$(CONFIG_UID16) += uid16.o
	obj-$(CONFIG_MODULES) += module.o
	obj-$(CONFIG_MODULE_SIG) += module_signing.o modsign_pubkey.o modsign_certificate.o
	obj-$(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-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
	obj-$(CONFIG_TREE_RCU) += rcutree.o
	obj-$(CONFIG_TREE_PREEMPT_RCU) += rcutree.o
	obj-$(CONFIG_TREE_RCU_TRACE) += rcutree_trace.o
	obj-$(CONFIG_TINY_RCU) += rcutiny.o
	obj-$(CONFIG_TINY_PREEMPT_RCU) += rcutiny.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)/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)

	ifeq ($(CONFIG_MODULE_SIG),y)
	###############################################################################
	#
	# Roll all the X.509 certificates that we can find together and pull them into
	# the kernel.
	#
	# 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.
	#
	###############################################################################
	X509_CERTIFICATES-y := $(wildcard .x509) $(wildcard $(srctree)/.x509)
	X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += signing_key.x509
	X509_CERTIFICATES := $(sort $(foreach CERT,$(X509_CERTIFICATES-y), \
	$(or $(realpath $(CERT)),$(CERT))))

	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/modsign_certificate.o: $(obj)/x509_certificate_list

	quiet_cmd_x509certs = CERTS $@
	cmd_x509certs = cat $(X509_CERTIFICATES) /dev/null >$@
	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 $(X509_CERTIFICATES) >$@

	clean-files := x509_certificate_list .x509.list

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