lkml.org 
[lkml]   [2018]   [Apr]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/2] slab: __GFP_ZERO is incompatible with a constructor
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....



\
 
 \ /
  Last update: 2018-04-10 19:46    [W:0.073 / U:30.604 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site