1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 2
3 # The compilers are complaining about unused v 3 # The compilers are complaining about unused variables inside an if(0) scope
4 # block. This is daft, shut them up. 4 # block. This is daft, shut them up.
5 ccflags-y += $(call cc-disable-warning, unused 5 ccflags-y += $(call cc-disable-warning, unused-but-set-variable)
6 6
7 # These files are disabled because they produc 7 # These files are disabled because they produce non-interesting flaky coverage
8 # that is not a function of syscall inputs. E. 8 # that is not a function of syscall inputs. E.g. involuntary context switches.
9 KCOV_INSTRUMENT := n 9 KCOV_INSTRUMENT := n
10 10
11 # Disable KCSAN to avoid excessive noise and p 11 # Disable KCSAN to avoid excessive noise and performance degradation. To avoid
12 # false positives ensure barriers implied by s 12 # false positives ensure barriers implied by sched functions are instrumented.
13 KCSAN_SANITIZE := n 13 KCSAN_SANITIZE := n
14 KCSAN_INSTRUMENT_BARRIERS := y 14 KCSAN_INSTRUMENT_BARRIERS := y
15 15
16 ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y) 16 ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
17 # According to Alan Modra <alan@linuxcare.com.a 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 en 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 thi 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 Sch 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 21 # to get a correct value for the wait-channel (WCHAN in ps). --davidm
22 CFLAGS_core.o := $(PROFILING) -fno-omit-frame- 22 CFLAGS_core.o := $(PROFILING) -fno-omit-frame-pointer
23 endif 23 endif
24 24
25 # 25 #
26 # Build efficiency: 26 # Build efficiency:
27 # 27 #
28 # These compilation units have roughly the sam 28 # These compilation units have roughly the same size and complexity - so their
29 # build parallelizes well and finishes roughly 29 # build parallelizes well and finishes roughly at once:
30 # 30 #
31 obj-y += core.o 31 obj-y += core.o
32 obj-y += fair.o 32 obj-y += fair.o
33 obj-y += build_policy.o 33 obj-y += build_policy.o
34 obj-y += build_utility.o 34 obj-y += build_utility.o
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