[PATCH] arm64: cache: Lower ARCH_DMA_MINALIGN to 64 (L1_CACHE_BYTES)

[Arnd Bergmann]

On Mon, Jun 7, 2021 at 5:17 PM Maxime Ripard <maxime at cerno.tech> wrote:
> On Mon, Jun 07, 2021 at 03:57:41PM +0200, Arnd Bergmann wrote:
> > On Mon, Jun 7, 2021 at 3:39 PM Will Deacon <will at kernel.org> wrote:
> > > On Mon, Jun 07, 2021 at 02:08:59PM +0100, Mark Rutland wrote:
> > > > On Mon, Jun 07, 2021 at 01:01:18PM +0100, Mark Rutland wrote:
> > > > > On Mon, Jun 07, 2021 at 11:58:32AM +0200, Marek Szyprowski wrote:
> > I notice that it checks index 'fifos_state[channel].in_use', but then
> > uses a different index 'i' for looking at the 'pending_commit' field
> > beyond the end of the array.
> >
> > This code was introduced by Maxime Ripard in commit 9ec03d7f1ed3
> >  ("drm/vc4: kms: Wait on previous FIFO users before a commit").
>
> Awesome, I tried to find out that bug a few weeks ago but couldn't
> reproduce the KASAN spat. You're right, it should be channel here
> instead of i. Since you did the whole work, do you want to send the
> patch?

Marek and Mark did most of the work finding the problem, I just looked
in the right place a few times (and a bit in the wrong place). I'd suggest
you send that patch with the corresponding Reported-by/Analyzed-by/
Tested-by tags.

        Arnd