Re: [PATCH 6/6] bmips: dma: drop redundant boot_cpu_type in arch_dma_sync

Christian Marangi
2024-05-03T19:39:15Z

On Fri, May 03, 2024 at 12:07:45PM -0700, Florian Fainelli wrote:
> On 5/3/24 06:54, Christian Marangi wrote:
> > Drop redundant boot_cpu_type in arch_sync_dma_for_cpu_all. These needs
> > to be parsed only once and we can make use of bmips_rac_flush_disable to
> > disable RAC flush on unsupported CPU.
> >
> > Set this value in bmips_cpu_setup for unsupported CPU to skip this
> > redundant check every time DMA needs to be synced.
> >
> > Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
>
> You are taking a shortcut that is reasonable in premise, but keying off the
> bmips_rac_flush_disable is IMHO misleading. The RAC is enabled in the
> BMIPS5000 and BMIPS5200 cores, just it does not need SW management unlike
> earlier cores.
>
> If you renamed it to bmips_rac_flush_needed that might be more compelling.
> Also, the other reason is that on a kernel that was configured for
> supporting only BMIPS5000 and BMIPS5200 CPUs, I think we could get some
> decent dead code elimination of the boot_cpu_type() check, which would not
> be the case.

I was a bit confused by the last part, should I drop this or just rename
the variable? Cause I think for kernel that support ONLY those CPU I
guess the DMA function will be optimized anyway since the bool will
always be false I guess?

--
Ansuel