On Wed, Jun 3, 2026 at 7:43 PM Yunseong Kim <[email protected]> wrote: > > Add CFLAGS_KCOV_DATAFLOW and RUSTFLAGS_KCOV_DATAFLOW exports to > scripts/Makefile.kcov, containing: > -fsanitize-coverage=dataflow-args,dataflow-ret -g > (with optional -fno-inline via CONFIG_KCOV_DATAFLOW_NO_INLINE) > > scripts/Makefile.lib applies these flags when a module's Makefile sets: > KCOV_DATAFLOW_file.o := y (per-file) > KCOV_DATAFLOW := y (per-directory) > > Also supports CONFIG_KCOV_DATAFLOW_INSTRUMENT_ALL for global enablement. > The flags are only applied to kernel objects (same guard as basic KCOV). > > Signed-off-by: Yunseong Kim <[email protected]> > --- > scripts/Makefile.kcov | 6 ++++++ > scripts/Makefile.lib | 7 +++++++ > 2 files changed, 13 insertions(+) > > diff --git a/scripts/Makefile.kcov b/scripts/Makefile.kcov > index 78305a84ba9d..101173fe194b 100644 > --- a/scripts/Makefile.kcov > +++ b/scripts/Makefile.kcov > @@ -2,10 +2,16 @@ > kcov-flags-y += > -fsanitize-coverage=trace-pc > kcov-flags-$(CONFIG_KCOV_ENABLE_COMPARISONS) += > -fsanitize-coverage=trace-cmp > > +# KCOV dataflow: trace function args and return values > +kcov-dataflow-flags-y := -fsanitize-coverage=dataflow-args,dataflow-ret -g
Instead of adding debug info here, consider adding a dependency on CONFIG_DEBUG_INFO. > export CFLAGS_KCOV := $(kcov-flags-y) > +export CFLAGS_KCOV_DATAFLOW := $(kcov-dataflow-flags-y) > +export RUSTFLAGS_KCOV_DATAFLOW := -Cpasses=sancov-module > -Cllvm-args=-sanitizer-coverage-level=3 > -Cllvm-args=-sanitizer-coverage-dataflow-args > -Cllvm-args=-sanitizer-coverage-dataflow-ret -Cdebuginfo=2 Ditto.
