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authorMarco Elver <elver@google.com>2019-11-14 19:02:58 +0100
committerPaul E. McKenney <paulmck@kernel.org>2019-11-16 16:23:14 +0100
commit0ebba7141eadc4804ec5b4bb5106331b0c3abf4c (patch)
treea617750df8458739f01d1255ab33249f1de4b25f /kernel/Makefile
parentobjtool, kcsan: Add KCSAN runtime functions to whitelist (diff)
downloadlinux-0ebba7141eadc4804ec5b4bb5106331b0c3abf4c.tar.xz
linux-0ebba7141eadc4804ec5b4bb5106331b0c3abf4c.zip
build, kcsan: Add KCSAN build exceptions
This blacklists several compilation units from KCSAN. See the respective inline comments for the reasoning. Signed-off-by: Marco Elver <elver@google.com> Acked-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/Makefile')
-rw-r--r--kernel/Makefile5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/Makefile b/kernel/Makefile
index 74ab46e2ebd1..cc53f7c25446 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -23,6 +23,9 @@ 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
@@ -30,6 +33,7 @@ KCOV_INSTRUMENT_extable.o := n
# Don't self-instrument.
KCOV_INSTRUMENT_kcov.o := n
KASAN_SANITIZE_kcov.o := n
+KCSAN_SANITIZE_kcov.o := n
CFLAGS_kcov.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector)
# cond_syscall is currently not LTO compatible
@@ -118,6 +122,7 @@ obj-$(CONFIG_RSEQ) += rseq.o
obj-$(CONFIG_GCC_PLUGIN_STACKLEAK) += stackleak.o
KASAN_SANITIZE_stackleak.o := n
+KCSAN_SANITIZE_stackleak.o := n
KCOV_INSTRUMENT_stackleak.o := n
$(obj)/configs.o: $(obj)/config_data.gz