Messages in this thread |  | | | Date | Wed, 1 Jun 2005 17:05:27 +0200 | | From | Andrea Arcangeli <> | | Subject | Re: RT patch acceptance |
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On Wed, Jun 01, 2005 at 04:45:57PM +0200, Esben Nielsen wrote: > the implementation of the former spinlock, now a mutex, is using a > raw_spin_lock, which disables interrupts.
It's not _raw_spin_lock that disables irq. It's spin_lock_irq that does that and it has been redefinined into an operation that doesn't disable irq.
The patent text goes like this "providing a software emulator to disable and enable interrupts from the general purpose operating system; marking interrupts as "soft disabled" and not "soft enabled" in response to requests from the general purpose operating system to disable interrupts; ".
I'm not a lawyer and I hope to be wrong, but I sure wouldn't bet the farm on it. You should ask a lawyer to make sure that non-GPL code is not infringing IMHO. This assuming that this could be a problem. It was a problem for RTAI users, people is used to the fact userland doesn't need to be GPL. Note that LGPL and BSD code will infringe too (i.e. no glibc etc..). - 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/
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