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Message-ID: <1312195147.8793.794.camel@pasglop> Date: Mon, 01 Aug 2011 20:39:07 +1000 From: Benjamin Herrenschmidt <benh@...nel.crashing.org> To: Peter Zijlstra <peterz@...radead.org> Cc: David Ahern <dsahern@...il.com>, anton@...ba.org, acme@...stprotocols.net, mingo@...e.hu, paulus@...ba.org, linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] perf: powerpc: Disable pagefaults during callchain stack read On Mon, 2011-08-01 at 11:59 +0200, Peter Zijlstra wrote: > > Signed-off-by: David Ahern <dsahern@...il.com> > > CC: Benjamin Herrenschmidt <benh@...nel.crashing.org> > > CC: Anton Blanchard <anton@...ba.org> > > Hmm, Paul, didn't you fix something like this early on? Anyway, I've > no > objections since I'm really not familiar enough with the PPC side of > things. I'm travelling so I haven't had a chance to review properly or even test but it looks like an ad-hoc fix for the immediate problem. Ultimately, I want to rework that stuff to do a __gup_fast like x86 does (maybe as a fallback from an attempt at access first) so we work around access permissions blocked by lack of dirty/accessed bits but in the meantime, this should fix the immediate issue. 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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