Re: [PATCH v2 08/11] kcov: add ioctl(KCOV_UNIQUE_ENABLE)

[Peter Zijlstra]

On Fri, Jun 27, 2025 at 03:58:59PM +0200, Alexander Potapenko wrote:

> There are two modes, -fsanitize-coverage=edge and
> -fsanitize-coverage=bb, with edge being the default one.

Thanks for the details!

> > Also, dynamic edges are very hard to allocate guard variables for, while
> > target guards are trivial, even in the face of dynamic edges.
> 
> All edges are known statically, because they are within the same
> function - calls between functions are not considered edges.

Oooh, that simplifies things a bit.

I suppose that even in the case of computed gotos you can create these
intermediate thunks because you have the whole thing at compile time
(not that there are a lot of those in the kernel).