Messages in this thread | | | Date | Tue, 25 Jul 2006 12:10:09 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] RTC: Add mmap method to rtc character driver |
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Neil Horman wrote: > > In general I agree, but that only works if you operate on a platform that > supports virtual syscalls, and has vdso configured. I'm not overly familiar > with vdso, but I didn't think vdso could be supported on all platforms/arches. > This seems like it might be a nice addition in those cases. >
Not really. This introduces a potentially very difficult support user-visible interface. Consider a tickless kernel -- you might end up taking tick interrupts ONLY to update this page, since you don't have any way of knowing when userspace wants to look at it.
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