[PATCH v2] ath10k: fix pointer arithmetic error in trace call

[Dan Carpenter]

On Thu, Feb 24, 2022 at 09:34:31AM +0200, Kalle Valo wrote:
> Francesco Magliocca <franciman12 at gmail.com> writes:
> 
> > Hi, I picked (void*) to be conformant with the other examples in htt_rx.c
> > For example at line 1431:
> >>    rxd = HTT_RX_BUF_TO_RX_DESC(hw,
> >>                    (void *)msdu->data - hw->rx_desc_ops->rx_desc_size);
> >
> > But for me it is ok. Maybe we should fix all the occurrences of this kind.
> 
> Yeah, it would be good to fix the void pointer arithmetic in a separate
> patch. I have planning to enable -Wpointer-arith in my ath10k-check and
> ath11k-check scripts, so patches are very welcome.

Void * casts simplify a lot of code.  Less noise.  More readable.
They're more accurate in a sense because it's not a u8 at all.  The
kernel can't compile with other compilers besides GCC and Clang so why
care about that the C standard hasn't caught up?

What does -Wpointer-arith buy us?

regards,
dan carpenter