On Tue, Oct 19, 2010 at 11:26 PM, Arnd Bergmann <arnd@xxxxxxxx> wrote: > On Tuesday 19 October 2010, Arnd Bergmann wrote: >> On Tuesday 19 October 2010 06:52:32 Dave Airlie wrote: >> > > I might be able to find some hardware still lying around here that uses an >> > > i810. Not sure unless I go hunting it. But I get the impression that if >> > > the kernel is a single-CPU kernel there is not any problem anyway? Don't >> > > distros offer a non-smp kernel as an installation option in case the user >> > > needs it? So in reality how big a problem is this? >> > >> > Not anymore, which is my old point of making a fuss. Nowadays in the >> > modern distro world, we supply a single kernel that can at runtime >> > decide if its running on SMP or UP and rewrite the text section >> > appropriately with locks etc. Its like magic, and something like >> > marking drivers as BROKEN_ON_SMP at compile time is really wrong when >> > what you want now is a runtime warning if someone tries to hotplug a >> > CPU with a known iffy driver loaded or if someone tries to load the >> > driver when we are already in SMP mode. >> >> We could make the driver run-time non-SMP by adding >> >> if (num_present_cpus() > 1) { >> pr_err("i810 no longer supports SMP\n"); >> return -EINVAL; >> } >> >> to the init function. That would cover the vast majority of the >> users of i810 hardware, I guess. > > Some research showed that Intel never support i810/i815 SMP setups, > but there was indeed one company (http://www.acorpusa.com at the time, > now owned by a domain squatter) that made i815E based dual Pentium-III > boards like this one: http://cgi.ebay.com/280319795096 Also that board has no on-board GPU enabled i815EP (P means no on-board GPU). So I think i810 is fine. > > The first person that can send me an authentic log file showing the > use of X.org with DRM on a 2.6.35 kernel with two processors on that > mainboard dated today or earlier gets a free upgrade to an AGP graphics > card of comparable or better 3D performance from me. Please include > the story how why you are running this machine with a new kernel. > > i830 is harder, apparently some i865G boards support Pentium 4 with HT > and even later dual-core processors. Also hyper-threaded 845G boards, however I'm happy to start a proper deprecation procedure on the i830 ABI, Its been a few years since a distro shipped with it, I think even RHEL5 has the i915 driver enabled, so we are probably talking RHEL4 era. Dave. -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html