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Date: Mon, 13 May 2013 17:46:20 +0800 From: Li Zhong <zhong@...ux.vnet.ibm.com> To: Benjamin Herrenschmidt <benh@...nel.crashing.org> Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, paulmck@...ux.vnet.ibm.com, fweisbec@...il.com, paulus@...ba.org, michael@...erman.id.au Subject: Re: [RFC PATCH v3 2/5] powerpc: Exception hooks for context tracking subsystem 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 majordomo@...r.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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