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

From: David S. Miller (
Date: Sun Jun 09 2002 - 23:27:05 EST

   From: Paul Mackerras <>
   Date: Sun, 9 Jun 2002 19:51:58 +1000 (EST)

   This is the problem scenario. Suppose we are doing DMA to a buffer B
   and also independently accessing a variable X which is not part of B.
   Suppose that X and the beginning of B are both in cache line C.
I see what the problem is. Hmmm...

I'm trying to specify this such that knowledge of cachelines and
whatnot don't escape the arch specific code, ho hum... Looks like
that isn't possible.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

This archive was generated by hypermail 2b29 : Sat Jun 15 2002 - 22:00:15 EST