mm/slab: abstract slabobj_ext access via new slab_obj_ext() helper

Browse source

Currently, the slab allocator assumes that slab->obj_exts is a pointer
to an array of struct slabobj_ext objects. However, to support storage
methods where struct slabobj_ext is embedded within objects, the slab
allocator should not make this assumption. Instead of directly
dereferencing the slabobj_exts array, abstract access to
struct slabobj_ext via helper functions.

Introduce a new API slabobj_ext metadata access:

  slab_obj_ext(slab, obj_exts, index) - returns the pointer to
  struct slabobj_ext element at the given index.

Directly dereferencing the return value of slab_obj_exts() is no longer
allowed. Instead, slab_obj_ext() must always be used to access
individual struct slabobj_ext objects.

Convert all users to use these APIs.
No functional changes intended.

Signed-off-by: Harry Yoo <harry.yoo@oracle.com>
Link: https://patch.msgid.link/20260113061845.159790-5-harry.yoo@oracle.com
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>

...

This commit is contained in:

Harry Yoo 2026-01-13 15:18:40 +09:00 • committed by Vlastimil Babka

parent 43d9bb4236

commit 52f1ca8a45

3 changed files with 79 additions and 32 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

23

mm/memcontrol.c

View file

43

mm/slab.h

View file

45

mm/slub.c

View file