Messages in this thread | | | Date | Mon, 17 Feb 2003 00:15:44 -0800 | From | Richard Henderson <> | Subject | Re: [PATCH][2.5] Protect smp_call_function_data w/ spinlocks on Alpha |
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On Fri, Feb 14, 2003 at 12:16:12PM -0500, Zwane Mwaikambo wrote: > Ok the reason being is that the lock not only protects the > smp_call_function_data pointer but also acts as a lock for that critical > section. Without it you'll constantly be overwriting the pointer halfway > through IPI acceptance (or even worse whilst a remote CPU is assigning the > data members).
Really. Show me the sequence there?
I happen to like the pointer_lock a lot, and think we should make more use of it on systems known to have cmpxchg. It saves on the number of cache lines that have to get bounced between processors.
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