[lkml]   [1999]   [Oct]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: GFP_DMA not good enough for problem hardware
   Date: Mon, 18 Oct 1999 10:32:18 +0100
From: Giuliano Procida <>

> Note also that this makes such cards out of spec, PCI wise. Many
> PCI sound cards have these issues as well (most implement the lower
> 24 bits, and use the upper bits in their DMA descriptors for control
> information, supposedly to save logic gates in the hw or to simplify
> it in some other way).
I haven't found anything obvious under drivers/sound.

They all use GFP_DMA and assume this means that the PCI bus mastering
address used for such a physical page will also be below 16MB, much of
drivers/sound has portability quirks like this.

David S. Miller

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:54    [from the cache]
©2003-2014 Jasper Spaans. hosted at Digital Ocean