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Merge tag 'slab-for-6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab

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Pull slab updates from Vlastimil Babka:
 "The main change is naturally the SLOB removal. Since its deprecation
  in 6.2 I've seen no complaints so hopefully SLUB_(TINY) works well for
  everyone and we can proceed.

  Besides the code cleanup, the main immediate benefit will be allowing
  kfree() family of function to work on kmem_cache_alloc() objects,
  which was incompatible with SLOB. This includes kfree_rcu() which had
  no kmem_cache_free_rcu() counterpart yet and now it shouldn't be
  necessary anymore.

  Besides that, there are several small code and comment improvements
  from Thomas, Thorsten and Vernon"

* tag 'slab-for-6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab:
  mm/slab: document kfree() as allowed for kmem_cache_alloc() objects
  mm/slob: remove slob.c
  mm/slab: remove CONFIG_SLOB code from slab common code
  mm, pagemap: remove SLOB and SLQB from comments and documentation
  mm, page_flags: remove PG_slob_free
  mm/slob: remove CONFIG_SLOB
  mm/slub: fix help comment of SLUB_DEBUG
  mm: slub: make kobj_type structure constant
  slab: Adjust comment after refactoring of gfp.h
This commit is contained in:
Linus Torvalds
2023-04-25 13:00:41 -07:00
parent 11704531dd ed4cdfbeb8
commit 736b378b29
16 changed files with 32 additions and 917 deletions
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17
Documentation/core-api/memory-allocation.rst
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@@ -170,7 +170,16 @@ should be used if a part of the cache might be copied to the userspace.
After the cache is created kmem_cache_alloc() and its convenience
wrappers can allocate memory from that cache.
When the allocated memory is no longer needed it must be freed. You can
use kvfree() for the memory allocated with `kmalloc`, `vmalloc` and
`kvmalloc`. The slab caches should be freed with kmem_cache_free(). And
don't forget to destroy the cache with kmem_cache_destroy().
When the allocated memory is no longer needed it must be freed.
Objects allocated by `kmalloc` can be freed by `kfree` or `kvfree`. Objects
allocated by `kmem_cache_alloc` can be freed with `kmem_cache_free`, `kfree`
or `kvfree`, where the latter two might be more convenient thanks to not
needing the kmem_cache pointer.
The same rules apply to _bulk and _rcu flavors of freeing functions.
Memory allocated by `vmalloc` can be freed with `vfree` or `kvfree`.
Memory allocated by `kvmalloc` can be freed with `kvfree`.
Caches created by `kmem_cache_create` should be freed with
`kmem_cache_destroy` only after freeing all the allocated objects first.