Messages in this thread |  | | Subject | Re: [SMP lock BUG?] Re: Feedback on preemptible kernel patch | From | Robert Love <> | Date | 17 Sep 2001 20:19:28 -0400 |
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On Mon, 2001-09-17 at 18:40, Manfred Spraul wrote: > > is it legal to kmap_atomic(a,b); kmap_atomic(c,d); kunmap_atomic(a,b); > > Yes, that's legal - just think about one kmap_atomic from process > context, and another one in irq context. > > > If so, your patch may need some ounting.... > > Pavel > > I hope ctx_sw_off does internal counting, correct?
yes, ctx_sw_off atomically increments a counter and ctx_sw_on atomic_dec_and_test()s it.
-- Robert M. Love rml at ufl.edu rml at tech9.net
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