Messages in this thread | | | Date | Tue, 31 Aug 2004 18:01:29 +0100 | From | Christoph Hellwig <> | Subject | Re: [rfc][patch] DRM initial function table support. |
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On Tue, Aug 31, 2004 at 09:07:11AM -0700, Ian Romanick wrote: > I think the intention is to have default functions set in the > device-independent code and have the device-dependent code over-ride > them. Since the defaults may not always be NULL, doing a struct like > that wouldn't really work. I suppose we could have a struct and a > device-independent function that copies the non-NULL pointers from the > per-device struct. Would that be better?
Don't copy them. Just put
if (foo->ops->method1) foo->ops->method1(args); else generic_method1(args);
in your code. It's an additional branch, but you avoid the indirect functioncalloverhead in exchange. - 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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