kernel/Makefile

   1 #
   2 # Makefile for the linux kernel.
   3 #
   4
   5 obj-y     = fork.o exec_domain.o panic.o \
   6             cpu.o exit.o itimer.o time.o softirq.o resource.o \
   7             sysctl.o sysctl_binary.o capability.o ptrace.o timer.o user.o \
   8             signal.o sys.o kmod.o workqueue.o pid.o task_work.o \
   9             extable.o params.o posix-timers.o \
  10             kthread.o sys_ni.o posix-cpu-timers.o \
  11             hrtimer.o nsproxy.o \
  12             notifier.o ksysfs.o cred.o reboot.o \
  13             async.o range.o groups.o smpboot.o
  14
  15 ifdef CONFIG_FUNCTION_TRACER
  16 # Do not trace debug files and internal ftrace files
  17 CFLAGS_REMOVE_cgroup-debug.o = -pg
  18 CFLAGS_REMOVE_irq_work.o = -pg
  19 endif
  20
  21 # cond_syscall is currently not LTO compatible
  22 CFLAGS_sys_ni.o = $(DISABLE_LTO)
  23
  24 obj-y += sched/
  25 obj-y += locking/
  26 obj-y += power/
  27 obj-y += printk/
  28 obj-y += irq/
  29 obj-y += rcu/
  30
  31 obj-$(CONFIG_CHECKPOINT_RESTORE) += kcmp.o
  32 obj-$(CONFIG_FREEZER) += freezer.o
  33 obj-$(CONFIG_PROFILING) += profile.o
  34 obj-$(CONFIG_STACKTRACE) += stacktrace.o
  35 obj-y += time/
  36 obj-$(CONFIG_FUTEX) += futex.o
  37 ifeq ($(CONFIG_COMPAT),y)
  38 obj-$(CONFIG_FUTEX) += futex_compat.o
  39 endif
  40 obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
  41 obj-$(CONFIG_SMP) += smp.o
  42 ifneq ($(CONFIG_SMP),y)
  43 obj-y += up.o
  44 endif
  45 obj-$(CONFIG_UID16) += uid16.o
  46 obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o
  47 obj-$(CONFIG_MODULES) += module.o
  48 obj-$(CONFIG_MODULE_SIG) += module_signing.o
  49 obj-$(CONFIG_KALLSYMS) += kallsyms.o
  50 obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
  51 obj-$(CONFIG_KEXEC) += kexec.o
  52 obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o
  53 obj-$(CONFIG_COMPAT) += compat.o
  54 obj-$(CONFIG_CGROUPS) += cgroup.o
  55 obj-$(CONFIG_CGROUP_FREEZER) += cgroup_freezer.o
  56 obj-$(CONFIG_CPUSETS) += cpuset.o
  57 obj-$(CONFIG_UTS_NS) += utsname.o
  58 obj-$(CONFIG_USER_NS) += user_namespace.o
  59 obj-$(CONFIG_PID_NS) += pid_namespace.o
  60 obj-$(CONFIG_IKCONFIG) += configs.o
  61 obj-$(CONFIG_RESOURCE_COUNTERS) += res_counter.o
  62 obj-$(CONFIG_SMP) += stop_machine.o
  63 obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
  64 obj-$(CONFIG_AUDIT) += audit.o auditfilter.o
  65 obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
  66 obj-$(CONFIG_AUDIT_WATCH) += audit_watch.o
  67 obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
  68 obj-$(CONFIG_GCOV_KERNEL) += gcov/
  69 obj-$(CONFIG_KPROBES) += kprobes.o
  70 obj-$(CONFIG_KGDB) += debug/
  71 obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o
  72 obj-$(CONFIG_LOCKUP_DETECTOR) += watchdog.o
  73 obj-$(CONFIG_SECCOMP) += seccomp.o
  74 obj-$(CONFIG_RELAY) += relay.o
  75 obj-$(CONFIG_SYSCTL) += utsname_sysctl.o
  76 obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
  77 obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
  78 obj-$(CONFIG_TRACEPOINTS) += tracepoint.o
  79 obj-$(CONFIG_LATENCYTOP) += latencytop.o
  80 obj-$(CONFIG_BINFMT_ELF) += elfcore.o
  81 obj-$(CONFIG_COMPAT_BINFMT_ELF) += elfcore.o
  82 obj-$(CONFIG_BINFMT_ELF_FDPIC) += elfcore.o
  83 obj-$(CONFIG_FUNCTION_TRACER) += trace/
  84 obj-$(CONFIG_TRACING) += trace/
  85 obj-$(CONFIG_TRACE_CLOCK) += trace/
  86 obj-$(CONFIG_RING_BUFFER) += trace/
  87 obj-$(CONFIG_TRACEPOINTS) += trace/
  88 obj-$(CONFIG_IRQ_WORK) += irq_work.o
  89 obj-$(CONFIG_CPU_PM) += cpu_pm.o
  90
  91 obj-$(CONFIG_PERF_EVENTS) += events/
  92
  93 obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o
  94 obj-$(CONFIG_PADATA) += padata.o
  95 obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
  96 obj-$(CONFIG_JUMP_LABEL) += jump_label.o
  97 obj-$(CONFIG_CONTEXT_TRACKING) += context_tracking.o
  98 obj-$(CONFIG_TORTURE_TEST) += torture.o
  99
 100 $(obj)/configs.o: $(obj)/config_data.h
 101
 102 # config_data.h contains the same information as ikconfig.h but gzipped.
 103 # Info from config_data can be extracted from /proc/config*
 104 targets += config_data.gz
 105 $(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE
 106         $(call if_changed,gzip)
 107
 108       filechk_ikconfiggz = (echo "static const char kernel_config_data[] __used = MAGIC_START"; cat $< | scripts/bin2c; echo "MAGIC_END;")
 109 targets += config_data.h
 110 $(obj)/config_data.h: $(obj)/config_data.gz FORCE
 111         $(call filechk,ikconfiggz)
 112
 113 $(obj)/time.o: $(obj)/timeconst.h
 114
 115 quiet_cmd_hzfile = HZFILE  $@
 116       cmd_hzfile = echo "hz=$(CONFIG_HZ)" > $@
 117
 118 targets += hz.bc
 119 $(obj)/hz.bc: $(objtree)/include/config/hz.h FORCE
 120         $(call if_changed,hzfile)
 121
 122 quiet_cmd_bc  = BC      $@
 123       cmd_bc  = bc -q $(filter-out FORCE,$^) > $@
 124
 125 targets += timeconst.h
 126 $(obj)/timeconst.h: $(obj)/hz.bc $(src)/timeconst.bc FORCE
 127         $(call if_changed,bc)
 128
 129 ###############################################################################
 130 #
 131 # Roll all the X.509 certificates that we can find together and pull them into
 132 # the kernel so that they get loaded into the system trusted keyring during
 133 # boot.
 134 #
 135 # We look in the source root and the build root for all files whose name ends
 136 # in ".x509".  Unfortunately, this will generate duplicate filenames, so we
 137 # have make canonicalise the pathnames and then sort them to discard the
 138 # duplicates.
 139 #
 140 ###############################################################################
 141 ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y)
 142 X509_CERTIFICATES-y := $(wildcard *.x509) $(wildcard $(srctree)/*.x509)
 143 X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += $(objtree)/signing_key.x509
 144 X509_CERTIFICATES-raw := $(sort $(foreach CERT,$(X509_CERTIFICATES-y), \
 145                                 $(or $(realpath $(CERT)),$(CERT))))
 146 X509_CERTIFICATES := $(subst $(realpath $(objtree))/,,$(X509_CERTIFICATES-raw))
 147
 148 ifeq ($(X509_CERTIFICATES),)
 149 $(warning *** No X.509 certificates found ***)
 150 endif
 151
 152 ifneq ($(wildcard $(obj)/.x509.list),)
 153 ifneq ($(shell cat $(obj)/.x509.list),$(X509_CERTIFICATES))
 154 $(info X.509 certificate list changed)
 155 $(shell rm $(obj)/.x509.list)
 156 endif
 157 endif
 158
 159 kernel/system_certificates.o: $(obj)/x509_certificate_list
 160
 161 quiet_cmd_x509certs  = CERTS   $@
 162       cmd_x509certs  = cat $(X509_CERTIFICATES) /dev/null >$@ $(foreach X509,$(X509_CERTIFICATES),; echo "  - Including cert $(X509)")
 163
 164 targets += $(obj)/x509_certificate_list
 165 $(obj)/x509_certificate_list: $(X509_CERTIFICATES) $(obj)/.x509.list
 166         $(call if_changed,x509certs)
 167
 168 targets += $(obj)/.x509.list
 169 $(obj)/.x509.list:
 170         @echo $(X509_CERTIFICATES) >$@
 171 endif
 172
 173 clean-files := x509_certificate_list .x509.list
 174
 175 ifeq ($(CONFIG_MODULE_SIG),y)
 176 ###############################################################################
 177 #
 178 # If module signing is requested, say by allyesconfig, but a key has not been
 179 # supplied, then one will need to be generated to make sure the build does not
 180 # fail and that the kernel may be used afterwards.
 181 #
 182 ###############################################################################
 183 ifndef CONFIG_MODULE_SIG_HASH
 184 $(error Could not determine digest type to use from kernel config)
 185 endif
 186
 187 signing_key.priv signing_key.x509: x509.genkey
 188         @echo "###"
 189         @echo "### Now generating an X.509 key pair to be used for signing modules."
 190         @echo "###"
 191         @echo "### If this takes a long time, you might wish to run rngd in the"
 192         @echo "### background to keep the supply of entropy topped up.  It"
 193         @echo "### needs to be run as root, and uses a hardware random"
 194         @echo "### number generator if one is available."
 195         @echo "###"
 196         openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
 197                 -batch -x509 -config x509.genkey \
 198                 -outform DER -out signing_key.x509 \
 199                 -keyout signing_key.priv 2>&1
 200         @echo "###"
 201         @echo "### Key pair generated."
 202         @echo "###"
 203
 204 x509.genkey:
 205         @echo Generating X.509 key generation config
 206         @echo  >x509.genkey "[ req ]"
 207         @echo >>x509.genkey "default_bits = 4096"
 208         @echo >>x509.genkey "distinguished_name = req_distinguished_name"
 209         @echo >>x509.genkey "prompt = no"
 210         @echo >>x509.genkey "string_mask = utf8only"
 211         @echo >>x509.genkey "x509_extensions = myexts"
 212         @echo >>x509.genkey
 213         @echo >>x509.genkey "[ req_distinguished_name ]"
 214         @echo >>x509.genkey "O = Magrathea"
 215         @echo >>x509.genkey "CN = Glacier signing key"
 216         @echo >>x509.genkey "emailAddress = slartibartfast@magrathea.h2g2"
 217         @echo >>x509.genkey
 218         @echo >>x509.genkey "[ myexts ]"
 219         @echo >>x509.genkey "basicConstraints=critical,CA:FALSE"
 220         @echo >>x509.genkey "keyUsage=digitalSignature"
 221         @echo >>x509.genkey "subjectKeyIdentifier=hash"
 222         @echo >>x509.genkey "authorityKeyIdentifier=keyid"
 223 endif