On Thu, 2016-03-31 at 18:45 -0700, Alexei Starovoitov wrote:

Eric, what's your take on Hannes's patch 2 ?
Is it more accurate to ask lockdep to check for actual lock
or lockdep can rely on owned flag?
Potentially there could be races between setting the flag and
actual lock... but that code is contained, so unlikely.
Will we find the real issues with this 'stronger' check or
just spend a ton of time adapting to new model like your other
patch for release_sock and whatever may need to come next...

More precise lockdep checks are certainly good, I only objected to 4/4
trying to work around another bug.

But why do we rush for 'net' tree ?

This looks net-next material to me.

Locking changes are often subtle, lets take the time to do them
properly.