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

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Message-ID: <aWC6bIEg6UqvX1DO@kernel.org>
Date: Fri, 9 Jan 2026 10:21:00 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Lain Fearyncess Yang <fearyncess@...c.io>
Cc: Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>,
	Kexy Biscuit <kexybiscuit@...c.io>, Mingcong Bai <jeffbai@...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>,
	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 Fri, Jan 09, 2026 at 01:10:51PM +0800, 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.

LoongArch version of set_memory* does not support splitting of leaf PMD
entries. Does LoongArch always use PTE-level mappings in the direct map?
 
> 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(-)

-- 
Sincerely yours,
Mike.