On Tue, 2012-09-04 at 16:51 +1000, Michael Ellerman wrote:

My guess would be we're calling that quite early and the __put_user()
check is getting confused and failing. That means we'll have left some
code unpatched, which then fails.

Can you try with the patch applied, but instead of returning if the
__put_user() fails, just continue on anyway.

That will isolate if it's something in the __put_user() (I doubt it), or
just that the __put_user() is failing and leaving the code unpatched.

As a test case, continuing on error is fine, but I would not recommend
that as a fix. If it fails, but still does the patch, that could be
harmful, and confusing of a result.

Need to figure out why put_user is failing.

-- Steve