Re: [RFC PATCH v2 0/6] kcov: per-task dataflow extraction at kernel function boundaries

Peter Zijlstra <[email protected]>
Newsgroups org.kernel.vger.linux-kbuild,dev.linux.lists.llvm,org.kernel.vger.linux-doc,org.kernel.vger.linux-kernel,org.kernel.vger.rust-for-linux,org.kernel.vger.workflows
Message-ID <[email protected]> 
On Fri, Jun 12, 2026 at 09:37:40AM +0200, Yunseong Kim wrote:
> Hi Peter,
> 
> > On Wed, Jun 03, 2026 at 07:43:27PM +0200, Yunseong Kim wrote:
> >> CONFIG_KCOV_DATAFLOW_INSTRUMENT_ALL instruments every function in the
> >> kernel. 
> > 
> > Well, I would hope it would very much not instrument noinstr functions.
> 
> Thank you for your guidance. I updated the default
> CONFIG_KCOV_DATAFLOW_NO_INLINE to n.

That's not really the point. The compiler extension *must* respect
noinstr. If there it no function attribute to suppress this kcov stuff,
then its an absolute non-starter.
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