Re: [PATCH] perf: powerpc: Disable pagefaults during callchain stack read

On Mon, 2011-08-01 at 11:59 +0200, Peter Zijlstra wrote:

quoted

Signed-off-by: David Ahern <redacted>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Anton Blanchard <redacted> 

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.