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 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. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html