linux-kernel - [RFC PATCH 1/9] gfp: Add GFP_PROTECTED for protected-node allocations

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Message-ID: <20251107224956.477056-2-gourry@gourry.net>
Date: Fri,  7 Nov 2025 17:49:46 -0500
From: Gregory Price <gourry@...rry.net>
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Subject: [RFC PATCH 1/9] gfp: Add GFP_PROTECTED for protected-node allocations

GFP_PROTECTED changes the nodemask checks when ALLOC_CPUSET
is set in the page allocator to check the full set of nodes
in cpuset->mems_allowed rather than just sysram nodes in
task->mems_default.

Signed-off-by: Gregory Price <gourry@...rry.net>
---
 include/linux/gfp_types.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/gfp_types.h b/include/linux/gfp_types.h
index 65db9349f905..2c0c250ade3a 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_PROTECTED_BIT,
 	___GFP_LAST_BIT
 };
 
@@ -103,6 +104,7 @@ enum {
 #else
 #define ___GFP_NO_OBJ_EXT       0
 #endif
+#define ___GFP_PROTECTED	BIT(___GFP_PROTECTED_BIT)
 
 /*
  * Physical address zone modifiers (see linux/mmzone.h - low four bits)
@@ -115,6 +117,7 @@ enum {
 #define __GFP_HIGHMEM	((__force gfp_t)___GFP_HIGHMEM)
 #define __GFP_DMA32	((__force gfp_t)___GFP_DMA32)
 #define __GFP_MOVABLE	((__force gfp_t)___GFP_MOVABLE)  /* ZONE_MOVABLE allowed */
+#define __GFP_PROTECTED	((__force gfp_t)___GFP_PROTECTED) /* Protected nodes allowed */
 #define GFP_ZONEMASK	(__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE)
 
 /**
-- 
2.51.1