linux-kernel - [PATCH v5 0/4] slab: Introduce kmalloc

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Message-Id: <20251122014258.do.018-kees@kernel.org>
Date: Fri, 21 Nov 2025 17:42:56 -0800
From: Kees Cook <kees@...nel.org>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: Kees Cook <kees@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Wilcox <willy@...radead.org>,
	Christoph Lameter <cl@...ux.com>,
	Marco Elver <elver@...gle.com>,
	Vegard Nossum <vegard.nossum@...cle.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Harry Yoo <harry.yoo@...cle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Jann Horn <jannh@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sasha Levin <sashal@...nel.org>,
	linux-mm@...ck.org,
	Nathan Chancellor <nathan@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Jonathan Corbet <corbet@....net>,
	Jakub Kicinski <kuba@...nel.org>,
	Yafang Shao <laoar.shao@...il.com>,
	Tony Ambardar <tony.ambardar@...il.com>,
	Alexander Lobakin <aleksander.lobakin@...el.com>,
	Jan Hendrik Farr <kernel@...rr.cc>,
	Alexander Potapenko <glider@...gle.com>,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	linux-doc@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [PATCH v5 0/4] slab: Introduce kmalloc_obj() and family

Hi,

Here's a refresh and update on the kmalloc_obj() API proposal for
discussion here and at LPC[1]. Please see patch 2 for the bulk of the
details. And note that this is obviously not v6.19 material! :)

The tree-wide patch for conversions is here:
https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?h=dev/v6.18-rc6/alloc_obj/v5&id=f79ee96ad6a3cafdb274fe15d3ae067724e72327

Thanks!

-Kees

[1] https://lpc.events/event/19/contributions/2136/

 v5:
  - switch to using assignment with type as first argument (Linus)
  - fix various comment, commit log, and kern-docs (Randy, Miguel)
  - renamed flex_counter internal helpers with "__" prefix (Przemek)
 v4: https://lore.kernel.org/lkml/20250315025852.it.568-kees@kernel.org/
 v3: https://lore.kernel.org/lkml/20240822231324.make.666-kees@kernel.org/
 v2: https://lore.kernel.org/lkml/20240807235433.work.317-kees@kernel.org/
 v1: https://lore.kernel.org/lkml/20240719192744.work.264-kees@kernel.org/

Kees Cook (4):
  compiler_types: Introduce __flex_counter() and family
  slab: Introduce kmalloc_obj() and family
  checkpatch: Suggest kmalloc_obj family for sizeof allocations
  coccinelle: Add kmalloc_objs conversion script

 scripts/checkpatch.pl                     |  39 ++++-
 scripts/coccinelle/api/kmalloc_objs.cocci | 168 +++++++++++++++++++++
 Documentation/process/deprecated.rst      |  42 ++++++
 include/linux/compiler_types.h            |  31 ++++
 include/linux/overflow.h                  |  40 +++++
 include/linux/slab.h                      | 172 ++++++++++++++++++++++
 6 files changed, 486 insertions(+), 6 deletions(-)
 create mode 100644 scripts/coccinelle/api/kmalloc_objs.cocci

-- 
2.34.1