mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
46b41d5dd8
If the timestamp of the .config file is updated, config_data.gz is
regenerated, then vmlinux is re-linked. This occurs even if the content
of the .config has not changed at all.
This issue was mitigated by commit 67424f61f8
("kconfig: do not write
.config if the content is the same"); Kconfig does not update the
.config when it ends up with the identical configuration.
The issue is remaining when the .config is created by *_defconfig with
some config fragment(s) applied on top.
This is typical for powerpc and mips, where several *_defconfig targets
are constructed by using merge_config.sh.
One workaround is to have the copy of the .config. The filechk rule
updates the copy, kernel/config_data, by checking the content instead
of the timestamp.
With this commit, the second run with the same configuration avoids
the needless rebuilds.
$ make ARCH=mips defconfig all
[ snip ]
$ make ARCH=mips defconfig all
*** Default configuration is based on target '32r2el_defconfig'
Using ./arch/mips/configs/generic_defconfig as base
Merging arch/mips/configs/generic/32r2.config
Merging arch/mips/configs/generic/el.config
Merging ./arch/mips/configs/generic/board-boston.config
Merging ./arch/mips/configs/generic/board-ni169445.config
Merging ./arch/mips/configs/generic/board-ocelot.config
Merging ./arch/mips/configs/generic/board-ranchu.config
Merging ./arch/mips/configs/generic/board-sead-3.config
Merging ./arch/mips/configs/generic/board-xilfpga.config
#
# configuration written to .config
#
SYNC include/config/auto.conf
CALL scripts/checksyscalls.sh
CALL scripts/atomic/check-atomics.sh
CHK include/generated/compile.h
CHK include/generated/autoksyms.h
Reported-by: Elliot Berman <eberman@codeaurora.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
162 lines
5.2 KiB
Makefile
162 lines
5.2 KiB
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
|
|
|
|
obj-$(CONFIG_USERMODE_DRIVER) += usermode_driver.o
|
|
obj-$(CONFIG_MODULES) += kmod.o
|
|
obj-$(CONFIG_MULTIUSER) += groups.o
|
|
|
|
ifdef CONFIG_FUNCTION_TRACER
|
|
# Do not trace internal ftrace files
|
|
CFLAGS_REMOVE_irq_work.o = $(CC_FLAGS_FTRACE)
|
|
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_module.o := n
|
|
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
|
|
CFLAGS_kcov.o := $(call cc-option, -fno-conserve-stack) -fno-stack-protector
|
|
|
|
# Don't instrument error handlers
|
|
CFLAGS_REMOVE_cfi.o := $(CC_FLAGS_CFI)
|
|
|
|
obj-y += sched/
|
|
obj-y += locking/
|
|
obj-y += power/
|
|
obj-y += printk/
|
|
obj-y += irq/
|
|
obj-y += rcu/
|
|
obj-y += livepatch/
|
|
obj-y += dma/
|
|
obj-y += entry/
|
|
|
|
obj-$(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.o
|
|
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-$(CONFIG_MODULES) += module.o
|
|
obj-$(CONFIG_MODULE_SIG) += module_signing.o
|
|
obj-$(CONFIG_MODULE_SIG_FORMAT) += module_signature.o
|
|
obj-$(CONFIG_KALLSYMS) += kallsyms.o
|
|
obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
|
|
obj-$(CONFIG_CRASH_CORE) += crash_core.o
|
|
obj-$(CONFIG_KEXEC_CORE) += kexec_core.o
|
|
obj-$(CONFIG_KEXEC) += kexec.o
|
|
obj-$(CONFIG_KEXEC_FILE) += kexec_file.o
|
|
obj-$(CONFIG_KEXEC_ELF) += kexec_elf.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_KPROBES_SANITY_TEST) += test_kprobes.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_PERF) += watchdog_hld.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-$(CONFIG_IRQ_WORK) += irq_work.o
|
|
obj-$(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_INLINE) += static_call.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-$(CONFIG_CRASH_DUMP) += crash_dump.o
|
|
obj-$(CONFIG_JUMP_LABEL) += jump_label.o
|
|
obj-$(CONFIG_CONTEXT_TRACKING) += context_tracking.o
|
|
obj-$(CONFIG_TORTURE_TEST) += torture.o
|
|
|
|
obj-$(CONFIG_HAS_IOMEM) += iomem.o
|
|
obj-$(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_stackleak.o += $(DISABLE_STACKLEAK_PLUGIN)
|
|
obj-$(CONFIG_GCC_PLUGIN_STACKLEAK) += stackleak.o
|
|
KASAN_SANITIZE_stackleak.o := n
|
|
KCSAN_SANITIZE_stackleak.o := n
|
|
KCOV_INSTRUMENT_stackleak.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)
|
|
|
|
$(obj)/kheaders.o: $(obj)/kheaders_data.tar.xz
|
|
|
|
quiet_cmd_genikh = CHK $(obj)/kheaders_data.tar.xz
|
|
cmd_genikh = $(CONFIG_SHELL) $(srctree)/kernel/gen_kheaders.sh $@
|
|
$(obj)/kheaders_data.tar.xz: FORCE
|
|
$(call cmd,genikh)
|
|
|
|
clean-files := kheaders_data.tar.xz kheaders.md5
|