linux-kernel - [PATCH] loongarch: wire up memfd

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Message-ID: <20260109051054.188030-1-fearyncess@aosc.io>
Date: Fri,  9 Jan 2026 13:10:51 +0800
From: Lain Fearyncess Yang <fearyncess@...c.io>
To: Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>
Cc: Kexy Biscuit <kexybiscuit@...c.io>,
	Mingcong Bai <jeffbai@...c.io>,
	"Lain \"Fearyncess\" Yang" <fearyncess@...c.io>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...nel.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Shuah Khan <shuah@...nel.org>,
	Paul Walmsley <pjw@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>,
	Arnd Bergmann <arnd@...db.de>,
	Jiaxun Yang <jiaxun.yang@...goat.com>,
	loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	linux-kselftest@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: [PATCH] loongarch: wire up memfd_secret system call

From: "Lain \"Fearyncess\" Yang" <fearyncess@...c.io>

LoongArch supports ARCH_HAS_SET_DIRECT_MAP, therefore wire up the
memfd_secret system call, which depends on it.

Signed-off-by: Lain "Fearyncess" Yang <fearyncess@...c.io>
---
 arch/loongarch/include/asm/unistd.h     | 1 +
 arch/loongarch/kernel/Makefile.syscalls | 6 +++---
 tools/testing/selftests/mm/Makefile     | 2 +-
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/loongarch/include/asm/unistd.h b/arch/loongarch/include/asm/unistd.h
index e2c0f3d86c7bd..e7649c1582482 100644
--- a/arch/loongarch/include/asm/unistd.h
+++ b/arch/loongarch/include/asm/unistd.h
@@ -10,5 +10,6 @@
 
 #define __ARCH_WANT_NEW_STAT
 #define __ARCH_WANT_SYS_CLONE
+#define __ARCH_WANT_MEMFD_SECRET
 
 #define NR_syscalls (__NR_syscalls)
diff --git a/arch/loongarch/kernel/Makefile.syscalls b/arch/loongarch/kernel/Makefile.syscalls
index cd46c2b69c7fd..6360381baf931 100644
--- a/arch/loongarch/kernel/Makefile.syscalls
+++ b/arch/loongarch/kernel/Makefile.syscalls
@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
 
-# No special ABIs on loongarch so far
-syscall_abis_32 +=
-syscall_abis_64 +=
+# Add memfd_secret explictly for la64 and la32
+syscall_abis_32 += memfd_secret
+syscall_abis_64 += memfd_secret
diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile
index eaf9312097f7b..79582438efc4d 100644
--- a/tools/testing/selftests/mm/Makefile
+++ b/tools/testing/selftests/mm/Makefile
@@ -72,7 +72,7 @@ TEST_GEN_FILES += madv_populate
 TEST_GEN_FILES += map_fixed_noreplace
 TEST_GEN_FILES += map_hugetlb
 TEST_GEN_FILES += map_populate
-ifneq (,$(filter $(ARCH),arm64 riscv riscv64 x86 x86_64))
+ifneq (,$(filter $(ARCH),arm64 riscv riscv64 x86 x86_64 loongarch32 loongarch64))
 TEST_GEN_FILES += memfd_secret
 endif
 TEST_GEN_FILES += migration
-- 
2.52.0