* Add a "how" argument to uma_zone constructors and initialization functions

  so that they know whether the allocation is supposed to be able to sleep
  or not.
* Allow uma_zone constructors and initialation functions to return either
  success or error.  Almost all of the ones in the tree currently return
  success unconditionally, but mbuf is a notable exception: the packet
  zone constructor wants to be able to fail if it cannot suballocate an
  mbuf cluster, and the mbuf allocators want to be able to fail in general
  in a MAC kernel if the MAC mbuf initializer fails.  This fixes the
  panics people are seeing when they run out of memory for mbuf clusters.
* Allow debug.nosleepwithlocks on WITNESS to be disabled, without changing
  the default.

Both bmilekic and jeff have reviewed the changes made to make failable
zone allocations work.

1 files changed, 4 insertions, 4 deletions

diff --git a/sys/vm/uma_dbg.h b/sys/vm/uma_dbg.h
index 5b44056..200f05d 100644
--- a/sys/vm/uma_dbg.h
+++ b/sys/vm/uma_dbg.h
@@ -37,15 +37,15 @@
 #ifndef VM_UMA_DBG_H
 #define VM_UMA_DBG_H
 
-void trash_ctor(void *mem, int size, void *arg);
+int trash_ctor(void *mem, int size, void *arg, int flags);
 void trash_dtor(void *mem, int size, void *arg);
-void trash_init(void *mem, int size);
+int trash_init(void *mem, int size, int flags);
 void trash_fini(void *mem, int size);
 
 /* For use only by malloc */
-void mtrash_ctor(void *mem, int size, void *arg);
+int mtrash_ctor(void *mem, int size, void *arg, int flags);
 void mtrash_dtor(void *mem, int size, void *arg);
-void mtrash_init(void *mem, int size);
+int mtrash_init(void *mem, int size, int flags);
 void mtrash_fini(void *mem, int size);
 
 void uma_dbg_free(uma_zone_t zone, uma_slab_t slab, void *item);