1# SPDX-License-Identifier: GPL-2.0 2 3# The compilers are complaining about unused variables inside an if(0) scope 4# block. This is daft, shut them up. 5ccflags-y += $(call cc-disable-warning, unused-but-set-variable) 6 7# These files are disabled because they produce non-interesting flaky coverage 8# that is not a function of syscall inputs. E.g. involuntary context switches. 9KCOV_INSTRUMENT := n 10 11# Disable KCSAN to avoid excessive noise and performance degradation. To avoid 12# false positives ensure barriers implied by sched functions are instrumented. 13KCSAN_SANITIZE := n 14KCSAN_INSTRUMENT_BARRIERS := y 15 16ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y) 17# According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is 18# needed for x86 only. Why this used to be enabled for all architectures is beyond 19# me. I suspect most platforms don't need this, but until we know that for sure 20# I turn this off for IA-64 only. Andreas Schwab says it's also needed on m68k 21# to get a correct value for the wait-channel (WCHAN in ps). --davidm 22CFLAGS_core.o := $(PROFILING) -fno-omit-frame-pointer 23endif 24 25# Branch profiling isn't noinstr-safe 26ifdef CONFIG_TRACE_BRANCH_PROFILING 27CFLAGS_build_policy.o += -DDISABLE_BRANCH_PROFILING 28CFLAGS_build_utility.o += -DDISABLE_BRANCH_PROFILING 29endif 30# 31# Build efficiency: 32# 33# These compilation units have roughly the same size and complexity - so their 34# build parallelizes well and finishes roughly at once: 35# 36obj-y += core.o 37obj-y += fair.o 38obj-y += build_policy.o 39obj-y += build_utility.o 40