Does the SPARC optimized crypto and CRC code actually work?

[Eric Biggers <ebiggers@kernel.org>]

Hi,

The Linux kernel contains various SPARC crypto opcodes optimized
functions in lib/crypto/sparc/, lib/crc/sparc/, and arch/sparc/crypto/.

As the kernel's crypto and CRC code has been refactored over time, we've
been updating how the SPARC optimized code is integrated accordingly.
However, QEMU doesn't support the SPARC crypto opcodes, which means that
even though I (and maybe others) been running the tests on SPARC kernels
in QEMU, this doesn't actually execute the SPARC optimized code.

So I have to ask: is someone in the SPARC community actually testing
this code regularly?  That includes running all the KUnit tests for
crypto and CRC as well as the traditional crypto self-tests.

If not, then unless QEMU support is forthcoming I'd suggest we drop this
code to avoid issues on SPARC systems.  The generic code is much better
tested and we know that it works on any architecture, including SPARC.
Correctness is the first priority, especially for cryptography.

- Eric