On Mon, 2013-05-13 at 19:06 +1000, Benjamin Herrenschmidt wrote: > 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).
Seems I added the hooks because of the trace point of hcall entry/exit ... Thanks, Zhong > > low_hash_fault() is a different beast. It will typically kill things, thus > involving sending signals etc... RCU might well be involved. > > Cheers, > Ben. > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
