Messages in this thread |  | | From | "Manfred Spraul" <> | Subject | Re: [SMP lock BUG?] Re: Feedback on preemptible kernel patch | Date | Sun, 9 Sep 2001 01:11:05 +0200 |
| |
> This is interesting. [Assumes UP Athlon - correct] > Note that all BUGs out in highmem.h:95 (kmap_atomic) > and that test is only on if you have enabled HIGHMEM_DEBUG > [my analyze is done with a 2.4.10-pre2 kernel, but I checked with > later patches and I do not think they fix it either...] > > The preemptive kernel puts more SMP stress on the kernel than > running with multiple CPUs. > > So this might be a potential bug in the kernel proper, running with > a SMP computer.
No. It seems to be a missing ctx_sw_off() in highmem.h: kmap_atomic uses a per-cpu variable, thus ctx_sw_off() is needed in kmap_atomic, and ctx_sw_on() in kunmap_atomic().
-- Manfred
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |