Messages in this thread | | | Subject | [Fwd: RE: cciss patches for 2.4.21-rc1, 4 of 4] | From | Arjan van de Ven <> | Date | 25 Apr 2003 16:29:15 +0200 |
| |
-----Forwarded Message-----
> From: Alan Cox <alan@lxorguk.ukuu.org.uk> > To: "Miller, Mike (OS Dev)" <Mike.Miller@hp.com> > Cc: "Cameron, Steve" <Steve.Cameron@hp.com>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org> > Subject: RE: cciss patches for 2.4.21-rc1, 4 of 4 > Date: 25 Apr 2003 14:09:53 +0100 > > On Gwe, 2003-04-25 at 14:48, Miller, Mike (OS Dev) wrote: > > I haven't seen any issues (yet) on ia64. I'm running with 5GB RAM. > > That doesn't make it correct. This same problem occurs in other drivers > and the usual trick is to set the pci mask to 32bit, allocate those > command buffers ready, then flip back to 64bit. Just be sure one thread > doesn't change it to 64bit while another is allocating commands. The > reverse is fine since an accidental odd bounce is no big deal Alan,
except that pci_alloc_consistent is guaranteed to return a 32 bit address
what you're thinking about is the mapping interface instead.
[unhandled content-type:application/pgp-signature] | |