linux-kernel - [RFC PATCH v2 03/11] gfp: Add GFP_SPM_NODE for Specific Purpose Memory (SPM) allocations

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251112192936.2574429-4-gourry@gourry.net>
Date: Wed, 12 Nov 2025 14:29:19 -0500
From: Gregory Price <gourry@...rry.net>
To: linux-mm@...ck.org
Cc: kernel-team@...a.com,
	linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	nvdimm@...ts.linux.dev,
	linux-fsdevel@...r.kernel.org,
	cgroups@...r.kernel.org,
	dave@...olabs.net,
	jonathan.cameron@...wei.com,
	dave.jiang@...el.com,
	alison.schofield@...el.com,
	vishal.l.verma@...el.com,
	ira.weiny@...el.com,
	dan.j.williams@...el.com,
	longman@...hat.com,
	akpm@...ux-foundation.org,
	david@...hat.com,
	lorenzo.stoakes@...cle.com,
	Liam.Howlett@...cle.com,
	vbabka@...e.cz,
	rppt@...nel.org,
	surenb@...gle.com,
	mhocko@...e.com,
	osalvador@...e.de,
	ziy@...dia.com,
	matthew.brost@...el.com,
	joshua.hahnjy@...il.com,
	rakie.kim@...com,
	byungchul@...com,
	gourry@...rry.net,
	ying.huang@...ux.alibaba.com,
	apopple@...dia.com,
	mingo@...hat.com,
	peterz@...radead.org,
	juri.lelli@...hat.com,
	vincent.guittot@...aro.org,
	dietmar.eggemann@....com,
	rostedt@...dmis.org,
	bsegall@...gle.com,
	mgorman@...e.de,
	vschneid@...hat.com,
	tj@...nel.org,
	hannes@...xchg.org,
	mkoutny@...e.com,
	kees@...nel.org,
	muchun.song@...ux.dev,
	roman.gushchin@...ux.dev,
	shakeel.butt@...ux.dev,
	rientjes@...gle.com,
	jackmanb@...gle.com,
	cl@...two.org,
	harry.yoo@...cle.com,
	axelrasmussen@...gle.com,
	yuanchu@...gle.com,
	weixugc@...gle.com,
	zhengqi.arch@...edance.com,
	yosry.ahmed@...ux.dev,
	nphamcs@...il.com,
	chengming.zhou@...ux.dev,
	fabio.m.de.francesco@...ux.intel.com,
	rrichter@....com,
	ming.li@...omail.com,
	usamaarif642@...il.com,
	brauner@...nel.org,
	oleg@...hat.com,
	namcao@...utronix.de,
	escape@...ux.alibaba.com,
	dongjoo.seo1@...sung.com
Subject: [RFC PATCH v2 03/11] gfp: Add GFP_SPM_NODE for Specific Purpose Memory (SPM) allocations

GFP_SPM_NODE changes the nodemask checks in the page allocator to include
the full set memory nodes, rather than just SysRAM nodes.

Signed-off-by: Gregory Price <gourry@...rry.net>
---
 include/linux/gfp_types.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/gfp_types.h b/include/linux/gfp_types.h
index 65db9349f905..525ae891420e 100644
--- a/include/linux/gfp_types.h
+++ b/include/linux/gfp_types.h
@@ -58,6 +58,7 @@ enum {
 #ifdef CONFIG_SLAB_OBJ_EXT
 	___GFP_NO_OBJ_EXT_BIT,
 #endif
+	___GFP_SPM_NODE_BIT,
 	___GFP_LAST_BIT
 };
 
@@ -103,6 +104,7 @@ enum {
 #else
 #define ___GFP_NO_OBJ_EXT       0
 #endif
+#define ___GFP_SPM_NODE		BIT(___GFP_SPM_NODE_BIT)
 
 /*
  * Physical address zone modifiers (see linux/mmzone.h - low four bits)
@@ -145,6 +147,8 @@ enum {
  * %__GFP_ACCOUNT causes the allocation to be accounted to kmemcg.
  *
  * %__GFP_NO_OBJ_EXT causes slab allocation to have no object extension.
+ *
+ * %__GFP_SPM_NODE allows the use of Specific Purpose Memory Nodes
  */
 #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE)
 #define __GFP_WRITE	((__force gfp_t)___GFP_WRITE)
@@ -152,6 +156,7 @@ enum {
 #define __GFP_THISNODE	((__force gfp_t)___GFP_THISNODE)
 #define __GFP_ACCOUNT	((__force gfp_t)___GFP_ACCOUNT)
 #define __GFP_NO_OBJ_EXT   ((__force gfp_t)___GFP_NO_OBJ_EXT)
+#define __GFP_SPM_NODE	((__force gfp_t)___GFP_SPM_NODE)
 
 /**
  * DOC: Watermark modifiers
-- 
2.51.1