Messages in this thread | | | Date | Tue, 10 Apr 2018 12:45:56 -0500 (CDT) | From | Christopher Lameter <> | Subject | Re: [PATCH 1/2] slab: __GFP_ZERO is incompatible with a constructor |
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On Tue, 10 Apr 2018, Matthew Wilcox wrote:
> > How do you envision dealing with the SLAB_TYPESAFE_BY_RCU slab caches? > > Those must have a defined state of the objects at all times and a constructor is > > required for that. And their use of RCU is required for numerous lockless > > lookup algorithms in the kernhel. > > Not at all times. Only once they've been used. Re-constructing them > once they've been used might break the rcu typesafety, I suppose ... > would need to examine the callers.
Objects can be freed and reused and still be accessed from code that thinks the object is the old and not the new object....
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