On Fri, 27 Apr 2007, Andrew Morton wrote:
>
> hm, could do. might_sleep() is intertwined with preempt in complex ways,
> but we did decouple that at the config level. no_mmap_sem() will dtrt for
> all preempt settings.
>
> But I'll be keeping this as a -mm-only debug patch (which brings us up to
> about thirty of 'em), so I think it's best to make it unconfigurable so we
> get maximum coverage.
>
> That's if it actually works. I haven't tried running it yet, and I have a
> feeling that running it might cause a big "doh" moment. We'll see.
Yes, I'm expecting the crucial
> + WARN_ON(rwsem_is_locked(&mm->mmap_sem))
to give a bogus warning every time another thread (or /proc,
or swapoff, or whatever) happens to have this mmap_sem locked.
might_sleep() is quite different, works on our thread's info.
Hugh
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