linux-yocto/kernel/Makefile

SPDX-License-Identifier: GPL-2.0

Makefile for the linux kernel.

obj-y = fork.o exec_domain.o panic.o
cpu.o exit.o softirq.o resource.o
sysctl.o capability.o ptrace.o user.o
signal.o sys.o umh.o workqueue.o pid.o task_work.o
extable.o params.o
kthread.o sys_ni.o nsproxy.o
notifier.o ksysfs.o cred.o reboot.o
async.o range.o smpboot.o ucount.o regset.o ksyms_common.o

obj-$(CONFIG_MULTIUSER) += groups.o obj-$(CONFIG_VHOST_TASK) += vhost_task.o

ifdef CONFIG_FUNCTION_TRACER

Do not trace internal ftrace files

CFLAGS_REMOVE_irq_work.o = $(CC_FLAGS_FTRACE) endif

Branch profiling isn't noinstr-safe

ifdef CONFIG_TRACE_BRANCH_PROFILING CFLAGS_context_tracking.o += -DDISABLE_BRANCH_PROFILING endif

Prevents flicker of uninteresting __do_softirq()/__local_bh_disable_ip()

in coverage traces.

KCOV_INSTRUMENT_softirq.o := n

Avoid KCSAN instrumentation in softirq ("No shared variables, all the data

are CPU local" => assume no data races), to reduce overhead in interrupts.

KCSAN_SANITIZE_softirq.o = n

These are called from save_stack_trace() on slub debug path,

and produce insane amounts of uninteresting coverage.

KCOV_INSTRUMENT_extable.o := n KCOV_INSTRUMENT_stacktrace.o := n

Don't self-instrument.

KCOV_INSTRUMENT_kcov.o := n

If sanitizers detect any issues in kcov, it may lead to recursion

via printk, etc.

KASAN_SANITIZE_kcov.o := n KCSAN_SANITIZE_kcov.o := n UBSAN_SANITIZE_kcov.o := n KMSAN_SANITIZE_kcov.o := n CFLAGS_kcov.o := $(call cc-option, -fno-conserve-stack) -fno-stack-protector

obj-y += sched/ obj-y += locking/ obj-y += power/ obj-y += printk/ obj-y += irq/ obj-y += rcu/ obj-y += livepatch/ obj-y += dma/ obj-y += entry/ obj-y += unwind/ obj-$(CONFIG_MODULES) += module/

obj-$(CONFIG_KCMP) += kcmp.o obj-$(CONFIG_FREEZER) += freezer.o obj-$(CONFIG_PROFILING) += profile.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-y += time/ obj-$(CONFIG_FUTEX) += futex/ obj-$(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_MODULE_SIG_FORMAT) += module_signature.o obj-$(CONFIG_KALLSYMS) += kallsyms.o obj-$(CONFIG_KALLSYMS_SELFTEST) += kallsyms_selftest.o obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o obj-$(CONFIG_VMCORE_INFO) += vmcore_info.o elfcorehdr.o obj-$(CONFIG_CRASH_RESERVE) += crash_reserve.o obj-$(CONFIG_KEXEC_CORE) += kexec_core.o obj-$(CONFIG_CRASH_DUMP) += crash_core.o obj-$(CONFIG_CRASH_DM_CRYPT) += crash_dump_dm_crypt.o obj-$(CONFIG_KEXEC) += kexec.o obj-$(CONFIG_KEXEC_FILE) += kexec_file.o obj-$(CONFIG_KEXEC_ELF) += kexec_elf.o obj-$(CONFIG_KEXEC_HANDOVER) += kexec_handover.o obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o obj-$(CONFIG_COMPAT) += compat.o obj-$(CONFIG_CGROUPS) += cgroup/ obj-$(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_IKHEADERS) += kheaders.o obj-$(CONFIG_SMP) += stop_machine.o obj-$(CONFIG_AUDIT) += audit.o auditfilter.o obj-$(CONFIG_AUDITSYSCALL) += auditsc.o audit_watch.o audit_fsnotify.o audit_tree.o obj-$(CONFIG_GCOV_KERNEL) += gcov/ obj-$(CONFIG_KCOV) += kcov.o obj-$(CONFIG_KPROBES) += kprobes.o obj-$(CONFIG_FAIL_FUNCTION) += fail_function.o obj-$(CONFIG_KGDB) += debug/ obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o obj-$(CONFIG_LOCKUP_DETECTOR) += watchdog.o obj-$(CONFIG_HARDLOCKUP_DETECTOR_BUDDY) += watchdog_buddy.o obj-$(CONFIG_HARDLOCKUP_DETECTOR_PERF) += watchdog_perf.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_FUNCTION_TRACER) += trace/ obj-$(CONFIG_TRACING) += trace/ obj-$(CONFIG_TRACE_CLOCK) += trace/ obj-$(CONFIG_RING_BUFFER) += trace/ obj-$(CONFIG_TRACEPOINTS) += trace/ obj-$(CONFIG_RETHOOK) += trace/ obj-$(CONFIG_IRQ_WORK) += irq_work.o obj-$(CONFIG_CPU_PM) += cpu_pm.o obj-$(CONFIG_BPF) += bpf/ obj-$(CONFIG_KCSAN) += kcsan/ obj-$(CONFIG_SHADOW_CALL_STACK) += scs.o obj-$(CONFIG_HAVE_STATIC_CALL) += static_call.o obj-$(CONFIG_HAVE_STATIC_CALL_INLINE) += static_call_inline.o obj-$(CONFIG_CFI_CLANG) += cfi.o

obj-$(CONFIG_PERF_EVENTS) += events/

obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o obj-$(CONFIG_PADATA) += padata.o obj-$(CONFIG_JUMP_LABEL) += jump_label.o obj-$(CONFIG_CONTEXT_TRACKING) += context_tracking.o obj-$(CONFIG_TORTURE_TEST) += torture.o

obj-$(CONFIG_HAS_IOMEM) += iomem.o obj-$(CONFIG_RSEQ) += rseq.o obj-$(CONFIG_WATCH_QUEUE) += watch_queue.o

obj-$(CONFIG_RESOURCE_KUNIT_TEST) += resource_kunit.o obj-$(CONFIG_SYSCTL_KUNIT_TEST) += sysctl-test.o

CFLAGS_kstack_erase.o += $(DISABLE_KSTACK_ERASE) CFLAGS_kstack_erase.o += $(call cc-option,-mgeneral-regs-only) obj-$(CONFIG_KSTACK_ERASE) += kstack_erase.o KASAN_SANITIZE_kstack_erase.o := n KCSAN_SANITIZE_kstack_erase.o := n KCOV_INSTRUMENT_kstack_erase.o := n

obj-$(CONFIG_SCF_TORTURE_TEST) += scftorture.o

$(obj)/configs.o: $(obj)/config_data.gz

targets += config_data config_data.gz $(obj)/config_data.gz: $(obj)/config_data FORCE $(call if_changed,gzip)

filechk_cat = cat $<

$(obj)/config_data: $(KCONFIG_CONFIG) FORCE $(call filechk,cat)

kheaders_data.tar.xz

$(obj)/kheaders.o: $(obj)/kheaders_data.tar.xz

quiet_cmd_kheaders_data = GEN $@ cmd_kheaders_data = "$<" "$@" "$(obj)/kheaders-srclist" "$(obj)/kheaders-objlist" "$(KBUILD_BUILD_TIMESTAMP)" cmd_kheaders_data_dep = cat $(depfile) >> $(dot-target).cmd; rm -f $(depfile)

define rule_kheaders_data $(call cmd_and_savecmd,kheaders_data) $(call cmd,kheaders_data_dep) endef

targets += kheaders_data.tar.xz $(obj)/kheaders_data.tar.xz: $(src)/gen_kheaders.sh $(obj)/kheaders-srclist $(obj)/kheaders-objlist $(obj)/kheaders.md5 FORCE $(call if_changed_rule,kheaders_data)

generated headers in objtree

include/generated/utsversion.h is ignored because it is generated

after gen_kheaders.sh is executed. (utsversion.h is unneeded for kheaders)

filechk_kheaders_objlist =
for d in include "arch/$(SRCARCH)/include"; do
find "$${d}/generated" ! -path "include/generated/utsversion.h" -a -name "*.h" -print;
done

$(obj)/kheaders-objlist: FORCE $(call filechk,kheaders_objlist)

non-generated headers in srctree

filechk_kheaders_srclist =
for d in include "arch/$(SRCARCH)/include"; do
find "$(srctree)/$${d}" -path "$(srctree)/$${d}/generated" -prune -o -name "*.h" -print;
done

$(obj)/kheaders-srclist: FORCE $(call filechk,kheaders_srclist)

Some files are symlinks. If symlinks are changed, kheaders_data.tar.xz should

be rebuilt.

filechk_kheaders_md5sum = xargs -r -a $< stat -c %N | md5sum

$(obj)/kheaders.md5: $(obj)/kheaders-srclist FORCE $(call filechk,kheaders_md5sum)

clean-files := kheaders.md5 kheaders-srclist kheaders-objlist