misc: fastrpc: is a ctx_idr IDR -> XArray conversion wanted?

[Murali Krishna]

Hi Srini, Ekansh,

I am new to kernel development and would like to start contributing. I
do not have much experience yet, but I am willing to learn and to put in
the work properly.

Documentation/core-api/idr.rst states that the IDR interface is
deprecated in favour of the XArray, and fastrpc's ctx_idr is still an
IDR. I have a conversion prepared -- XA_FLAGS_ALLOC1, xa_alloc_cyclic()
with the cursor kept in struct fastrpc_channel_ctx, xa_load() and
xa_erase(), and cctx->lock left as it is -- with no intended functional
change.

Before posting it, I would rather ask than take up your review time: is
such a conversion wanted in fastrpc, or is the IDR usage here fine as it
is? I have seen similar conversions in other subsystems declined as
unnecessary, so I did not want to assume.

I should also say that it is build- and sparse-tested only (x86_64,
COMPILE_TEST, W=1 C=1, no new warnings). I have no Qualcomm hardware, so
the converted path has never actually run.

I am aware of the accel/qda series, described as an alternative to this
driver. If fastrpc.c is effectively in maintenance mode, that is a good
reason to say no.

If the answer is no, I would be grateful if you could point me towards
something you would actually like to see worked on here. I am happy to
start with something small and learn from the review.

Thank you for your time,
Murali Krishna