Re: PCI DMA to small buffers on cache-incoherent arch

William Jhun
2002-06-11T15:57:23Z

On Tue, Jun 11, 2002 at 12:43:05AM -0700, David S. Miller wrote:
> From: "David S. Miller" <davem@redhat.com>
> Date: Tue, 11 Jun 2002 00:36:25 -0700 (PDT)
>
> The DMA_ALIGN attribute doesn't work, on some systems the PCI
> cacheline size is determined at boot time not compile time.
>
> Another note, it could be per-PCI controller what this cacheline size
> is. We'll need to pass in a pdev to the alignment interfaces to
> do this correctly.
>
> So none of this can be done at compile time folks.

Why is this a problem? So you just make a static inline that takes the
pdev and does the Right Thing at runtime... It's implementation-
dependent whether it's a compile-time macro or a more elaborate
inline...