Re: [PATCH v2 3/3] arch/*/: remove CONFIG_VIRT_TO_BUS

Arnd Bergmann
2022-06-28T21:51:00Z

On Tue, Jun 28, 2022 at 11:03 PM Michael Schmitz <schmitzmic@gmail.com> wrote:
> On 28/06/22 19:03, Geert Uytterhoeven wrote:
> >> The driver allocates bounce buffers using kmalloc if it hits an
> >> unaligned data buffer - can such buffers still even happen these days?
> > No idea.
> Hmmm - I think I'll stick a WARN_ONCE() in there so we know whether this
> code path is still being used.

kmalloc() guarantees alignment to the next power-of-two size or
KMALLOC_MIN_ALIGN, whichever is bigger. On m68k this means it
is cacheline aligned.

Arnd