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

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Message-ID: <b5502d6c-62c2-41bb-9564-3741656e07e2@kernel.org>
Date: Fri, 9 Jan 2026 14:28:43 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: Lain Fearyncess Yang <fearyncess@...c.io>,
 Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>
Cc: Kexy Biscuit <kexybiscuit@...c.io>, Mingcong Bai <jeffbai@...c.io>,
 Andrew Morton <akpm@...ux-foundation.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: Re: [PATCH] loongarch: wire up memfd_secret system call

On 1/9/26 06:10, Lain Fearyncess Yang wrote:
> 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))

For the core-mm bits

Acked-by: David Hildenbrand (Red Hat) <david@...nel.org>

-- 
Cheers

David