Re: [PATCH] hw/dma/omap_dma.c: Use 64 bit maths for omap_dma_transfer_setup

[Jim MacArthur <jim.macarthur@linaro.org>]

On 12/5/25 10:33, Peter Maydell wrote:
> On Thu, 4 Dec 2025 at 19:34, Jim MacArthur <jim.macarthur@linaro.org> wrote:
>> If both frame and element count are 65535, which appears valid from my
>> reading of the OMAP5912 documentation, then some of the calculations
>> will overflow the 32-bit signed integer range and produce a negative
>> min_elems value.
>>
>> Raised by #3204 (https://gitlab.com/qemu-project/qemu/-/issues/3204).
> The real hardware is surely not doing 64-bit arithmetic though.
> It's presumably working with elements * frames as unsigned 32 bit
> multiplication.
>
> -- PMM

I agree it's unlikely that the hardware would use 64 bit maths, but 
without any spec (that I've found so far) or real hardware to test on, I 
can't be sure what the expected behaviour is.

If we think that uint32_t is a more likely situation than the current 
`int` then I'm happy to change it to that.

Jim