Re: [PATCH v2 01/19] riscv: hwprobe: factorize hwprobe ISA extension reporting

[Andrew Jones]

On Thu, Oct 19, 2023 at 11:22:26AM +0100, Conor Dooley wrote:
> On Thu, Oct 19, 2023 at 09:26:31AM +0200, Clément Léger wrote:
...
> > BTW, wouldn't
> > it make more sense to get rid out of the unsupported extensions directly
> > at ISA string parsing ? ie, if kernel is compiled without V support,
> > then do not set the bits corresponding to these in the riscv_isa_ext[]
> > array ? But the initial intent was probably to be able to report the
> > full string through cpuinfo.
> 
> Yeah, hysterical raisins I guess, it's always been that way. I don't
> think anyone originally thought about such configurations and that is
> how the cpuinfo stuff behaves. I strongly dislike the
> riscv_isa_extension_available() interface, but one of Drew's patches
> does at least improve things a bit. Kinda waiting for some of the
> patches in flight to settle down before deciding if I want to refactor
> stuff to be less of a potential for shooting oneself in the foot.

And I recall promising to try and do something with it too, but that
promise got buried under other promises... It's still on the TODO, at
least!

drew