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authorMarco Elver <elver@google.com>2021-11-30 12:44:14 +0100
committerPaul E. McKenney <paulmck@kernel.org>2021-12-09 16:42:26 -0800
commit48c9e28e1e249c97bcbf68451947649c55b8c09e (patch)
tree44a91fc9e807de5a04197b68565ea4416898336d /scripts
parent0b8b0830ac1419d7250fde31ea78793a03f3db44 (diff)
downloadlinux-48c9e28e1e249c97bcbf68451947649c55b8c09e.tar.bz2
kcsan, kbuild: Add option for barrier instrumentation only
Source files that disable KCSAN via KCSAN_SANITIZE := n, remove all instrumentation, including explicit barrier instrumentation. With instrumentation for memory barriers, in few places it is required to enable just the explicit instrumentation for memory barriers to avoid false positives. Providing the Makefile variable KCSAN_INSTRUMENT_BARRIERS_obj.o or KCSAN_INSTRUMENT_BARRIERS (for all files) set to 'y' only enables the explicit barrier instrumentation. Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'scripts')
-rw-r--r--scripts/Makefile.lib5
1 files changed, 5 insertions, 0 deletions
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index d1f865b8c0cb..ab17f7b2e33c 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -182,6 +182,11 @@ ifeq ($(CONFIG_KCSAN),y)
_c_flags += $(if $(patsubst n%,, \
$(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \
$(CFLAGS_KCSAN))
+# Some uninstrumented files provide implied barriers required to avoid false
+# positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only.
+_c_flags += $(if $(patsubst n%,, \
+ $(KCSAN_INSTRUMENT_BARRIERS_$(basetarget).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \
+ -D__KCSAN_INSTRUMENT_BARRIERS__)
endif
# $(srctree)/$(src) for including checkin headers from generated source files