Messages in this thread | | | Subject | Re: [RFC PATCH v3 2/5] powerpc: Exception hooks for context tracking subsystem | From | Benjamin Herrenschmidt <> | Date | Mon, 13 May 2013 19:06:31 +1000 |
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On Mon, 2013-05-13 at 16:44 +0800, Li Zhong wrote: > Yes, the above and hash_page() are two C functions for a same exception. > And the exception hooks enable RCU usage in those C codes. But for asm > codes, I think we could assume that there would be no RCU usage there, > so we don't need wrap them in the hooks.
hash_page() won't start a new RCU, at least not in its current incarnation, the only thing I can see it ever doing would be to take some RCU read locks one day (it doesn't today).
low_hash_fault() is a different beast. It will typically kill things, thus involving sending signals etc... RCU might well be involved.
Cheers, Ben.
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