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    Subject[PATCH v3 06/25] kcsan, kbuild: Add option for barrier instrumentation only
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    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>
    ---
    scripts/Makefile.lib | 5 +++++
    1 file changed, 5 insertions(+)

    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
    --
    2.34.0.rc2.393.gf8c9666880-goog
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