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There's no fundamental reason to disable KCSAN for scheduler code, except for excessive noise and performance concerns (instrumenting scheduler code is usually a good way to stress test KCSAN itself). However, several core sched functions imply memory barriers that are invisible to KCSAN without instrumentation, but are required to avoid false positives. Therefore, unconditionally enable instrumentation of memory barriers in scheduler code. Also update the comment to reflect this and be a bit more brief. Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
42 lines
1.8 KiB
Makefile
42 lines
1.8 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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ifdef CONFIG_FUNCTION_TRACER
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CFLAGS_REMOVE_clock.o = $(CC_FLAGS_FTRACE)
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endif
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# The compilers are complaining about unused variables inside an if(0) scope
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# block. This is daft, shut them up.
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ccflags-y += $(call cc-disable-warning, unused-but-set-variable)
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# These files are disabled because they produce non-interesting flaky coverage
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# that is not a function of syscall inputs. E.g. involuntary context switches.
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KCOV_INSTRUMENT := n
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# Disable KCSAN to avoid excessive noise and performance degradation. To avoid
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# false positives ensure barriers implied by sched functions are instrumented.
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KCSAN_SANITIZE := n
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KCSAN_INSTRUMENT_BARRIERS := y
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ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
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# According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
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# needed for x86 only. Why this used to be enabled for all architectures is beyond
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# me. I suspect most platforms don't need this, but until we know that for sure
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# I turn this off for IA-64 only. Andreas Schwab says it's also needed on m68k
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# to get a correct value for the wait-channel (WCHAN in ps). --davidm
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CFLAGS_core.o := $(PROFILING) -fno-omit-frame-pointer
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endif
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obj-y += core.o loadavg.o clock.o cputime.o
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obj-y += idle.o fair.o rt.o deadline.o
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obj-y += wait.o wait_bit.o swait.o completion.o
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obj-$(CONFIG_SMP) += cpupri.o cpudeadline.o topology.o stop_task.o pelt.o
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obj-$(CONFIG_SCHED_AUTOGROUP) += autogroup.o
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obj-$(CONFIG_SCHEDSTATS) += stats.o
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obj-$(CONFIG_SCHED_DEBUG) += debug.o
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obj-$(CONFIG_CGROUP_CPUACCT) += cpuacct.o
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obj-$(CONFIG_CPU_FREQ) += cpufreq.o
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obj-$(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) += cpufreq_schedutil.o
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obj-$(CONFIG_MEMBARRIER) += membarrier.o
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obj-$(CONFIG_CPU_ISOLATION) += isolation.o
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obj-$(CONFIG_PSI) += psi.o
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obj-$(CONFIG_SCHED_CORE) += core_sched.o
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