linux-kernel - [PATCH 1/5] mm/mseal: always define VM

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Message-ID: <f6dd43a1111677145b815b31bca8a04db0862c53.1752497324.git.lorenzo.stoakes@oracle.com>
Date: Mon, 14 Jul 2025 14:00:36 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        David Hildenbrand <david@...hat.com>, Vlastimil Babka <vbabka@...e.cz>,
        Jann Horn <jannh@...gle.com>, Pedro Falcato <pfalcato@...e.de>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Jeff Xu <jeffxu@...omium.org>
Subject: [PATCH 1/5] mm/mseal: always define VM_SEALED

There is no reason to treat VM_SEALED in a special way, in each other case
in which a VMA flag is unavailable due to configuration, we simply assign
that flag to VM_NONE, make VM_SEALED consistent with all other VMA flags in
this respect.

Additionally, use the next available bit for VM_SEALED, 42, rather than
arbitrarily putting it at 63 and update the declaration to match all other
VMA flags.

No functional change intended.

Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
---
 include/linux/mm.h               | 6 ++++--
 tools/testing/vma/vma_internal.h | 6 ++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 2e5459d43267..aba67c3df42b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -414,8 +414,10 @@ extern unsigned int kobjsize(const void *objp);
 #endif

 #ifdef CONFIG_64BIT
-/* VM is sealed, in vm_flags */
-#define VM_SEALED	_BITUL(63)
+#define VM_SEALED_BIT	42
+#define VM_SEALED	BIT(VM_SEALED_BIT)
+#else
+#define VM_SEALED	VM_NONE
 #endif

 /* Bits set in the VMA until the stack is in its final location */
diff --git a/tools/testing/vma/vma_internal.h b/tools/testing/vma/vma_internal.h
index 991022e9e0d3..0fe52fd6782b 100644
--- a/tools/testing/vma/vma_internal.h
+++ b/tools/testing/vma/vma_internal.h
@@ -108,8 +108,10 @@ extern unsigned long dac_mmap_min_addr;
 #define CAP_IPC_LOCK         14

 #ifdef CONFIG_64BIT
-/* VM is sealed, in vm_flags */
-#define VM_SEALED	_BITUL(63)
+#define VM_SEALED_BIT	42
+#define VM_SEALED	BIT(VM_SEALED_BIT)
+#else
+#define VM_SEALED	VM_NONE
 #endif

 #define FIRST_USER_ADDRESS	0UL
--
2.50.1