+ mseal-sysmap-enable-loongarch.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

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The patch titled
     Subject: mseal sysmap: enable LoongArch
has been added to the -mm mm-unstable branch.  Its filename is
     mseal-sysmap-enable-loongarch.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mseal-sysmap-enable-loongarch.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: WangYuli <wangyuli@uniontech.com>
Subject: mseal sysmap: enable LoongArch
Date: Tue, 15 Apr 2025 23:39:03 +0800

Provide support for CONFIG_MSEAL_SYSTEM_MAPPINGS on LoongArch, covering
the vdso.

Link: https://lore.kernel.org/all/25bad37f-273e-4626-999c-e1890be96182@lucifer.local/
Link: https://lkml.kernel.org/r/648AB3031B5618C0+20250415153903.570662-1-wangyuli@uniontech.com
Signed-off-by: Yuli Wang <wangyuli@uniontech.com>
Tested-by: Yuli Wang <wangyuli@uniontech.com>
Acked-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Jeff Xu <jeffxu@chromium.org>
Acked-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Cheng Nie <niecheng1@uniontech.com>
Cc: Guan Wentao <guanwentao@uniontech.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Jason A. Donenfeld <jason@zx2c4.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 Documentation/features/core/mseal_sys_mappings/arch-support.txt |    2 +-
 Documentation/userspace-api/mseal.rst                           |    2 +-
 arch/loongarch/Kconfig                                          |    1 +
 arch/loongarch/kernel/vdso.c                                    |    4 +++-
 4 files changed, 6 insertions(+), 3 deletions(-)

--- a/arch/loongarch/Kconfig~mseal-sysmap-enable-loongarch
+++ a/arch/loongarch/Kconfig
@@ -69,6 +69,7 @@ config LOONGARCH
 	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
 	select ARCH_SUPPORTS_LTO_CLANG
 	select ARCH_SUPPORTS_LTO_CLANG_THIN
+	select ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS
 	select ARCH_SUPPORTS_NUMA_BALANCING
 	select ARCH_SUPPORTS_RT
 	select ARCH_USE_BUILTIN_BSWAP
--- a/arch/loongarch/kernel/vdso.c~mseal-sysmap-enable-loongarch
+++ a/arch/loongarch/kernel/vdso.c
@@ -105,7 +105,9 @@ int arch_setup_additional_pages(struct l
 
 	vdso_addr = data_addr + VVAR_SIZE;
 	vma = _install_special_mapping(mm, vdso_addr, info->size,
-				       VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC,
+				       VM_READ | VM_EXEC |
+				       VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |
+				       VM_SEALED_SYSMAP,
 				       &info->code_mapping);
 	if (IS_ERR(vma)) {
 		ret = PTR_ERR(vma);
--- a/Documentation/features/core/mseal_sys_mappings/arch-support.txt~mseal-sysmap-enable-loongarch
+++ a/Documentation/features/core/mseal_sys_mappings/arch-support.txt
@@ -12,7 +12,7 @@
     |       arm64: |  ok  |
     |        csky: |  N/A |
     |     hexagon: |  N/A |
-    |   loongarch: | TODO |
+    |   loongarch: |  ok  |
     |        m68k: |  N/A |
     |  microblaze: |  N/A |
     |        mips: | TODO |
--- a/Documentation/userspace-api/mseal.rst~mseal-sysmap-enable-loongarch
+++ a/Documentation/userspace-api/mseal.rst
@@ -144,7 +144,7 @@ Use cases
   architecture.
 
   The following architectures currently support this feature: x86-64, arm64,
-  and s390.
+  loongarch and s390.
 
   WARNING: This feature breaks programs which rely on relocating
   or unmapping system mappings. Known broken software at the time
_

Patches currently in -mm which might be from wangyuli@uniontech.com are

mseal-sysmap-enable-loongarch.patch
ocfs2-o2net_idle_timer-rename-del_timer_sync-in-comment.patch