[PATCH v2 6/6] selftests: arm64: Add build and documentation for FP tests

[Dave Martin]

On Wed, Aug 19, 2020 at 12:48:37PM +0100, Mark Brown wrote:
> Integrate the FP tests with the build system and add some documentation
> for the ones run outside the kselftest infrastructure.  The content in
> the README was largely written by Dave Martin with edits by me.

Apologies, I never got around to looking at all this, though it seems
reasonable.


I don't know whether this is worth following up with a TODO?

Some things I was aware of:

 * The sve-test/fpsimd-test programs contain a lot of common
   boilerplate and could probably be merged together.

 * A fair amount of the asm in sve-test/fpsimd-test could be converted
   to C, with -fgeneral-regs-only.  This would be helpful since the
   code is highly unmaintainable in its current form (I know, I've
   tried).  Calling library functions would still be a problem, but we
   might be able to lift a printf implementation and some basic syscall
   wrappers from elsewhere rather than reimplementing everything from
   scratch.

 * The sve-stress/fpsimd-stress scripts could likewise be merged.
   Also, doing the required process management from the shell seems a
   doomed enterprise and it never really worked 100% right.  Eventually
   it might be worth rewriting a common test driver for these in a real
   language.

 * While the tests confirm that basic aspects of the SVE support don't
   explode, there is not a lot of checking that the kernel does the
   _correct_ thing -- so there's scope for improvement here if somebody
   gets around to it.

Cheers
---Dave