Re: [RFC PATCH v2 1/6] kcov: add per-task dataflow tracking for function arguments/return values
Peter Zijlstra <[email protected]>
| Newsgroups | org.kernel.vger.workflows,dev.linux.lists.llvm,org.kernel.vger.linux-doc,org.kernel.vger.linux-kbuild,org.kernel.vger.linux-kernel,org.kernel.vger.rust-for-linux |
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| Message-ID | <[email protected]> |
On Wed, Jun 03, 2026 at 07:43:28PM +0200, Yunseong Kim wrote: > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug > index e2f976c3301b..abd1a94589aa 100644 > --- a/lib/Kconfig.debug > +++ b/lib/Kconfig.debug > @@ -2261,6 +2261,28 @@ config KCOV_SELFTEST > On test failure, causes the kernel to panic. Recommended to be > enabled, ensuring critical functionality works as intended. > > + ^ This line... > +config KCOV_DATAFLOW_ARGS > + bool "Enable KCOV dataflow: function argument capture" > + depends on KCOV > + depends on $(cc-option,-fsanitize-coverage=dataflow-args) > + help > + Captures function arguments at entry via /sys/kernel/debug/kcov_dataflow. > + Struct pointer arguments are auto-expanded using compiler DebugInfo > + metadata, recording individual field values at runtime. > + Enable per-module with: KCOV_DATAFLOW_file.o := y in the Makefile. > + Requires clang with -fsanitize-coverage=dataflow-args support. > + > +config KCOV_DATAFLOW_RET > + bool "Enable KCOV dataflow: return value capture" > + depends on KCOV > + depends on $(cc-option,-fsanitize-coverage=dataflow-ret) > + help > + Captures function return values via /sys/kernel/debug/kcov_dataflow. > + Struct pointer returns are auto-expanded using compiler DebugInfo > + metadata, recording individual field values at runtime. > + Enable per-module with: KCOV_DATAFLOW_file.o := y in the Makefile. > + Requires clang with -fsanitize-coverage=dataflow-ret support. Probably wants to be here... > config DEBUG_AID_FOR_SYZBOT > bool "Additional debug code for syzbot" > default n > > -- > 2.43.0 >