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

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Message-ID: <CAAhV-H5tHZRHmXSA6m+fyhaN9nNjLFbEiVK7OWjL8EoJn16doQ@mail.gmail.com>
Date: Sun, 25 Jan 2026 12:03:25 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Mike Rapoport <rppt@...nel.org>
Cc: Lain Fearyncess Yang <fearyncess@...c.io>, 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 9, 2026 at 4:21 PM Mike Rapoport <rppt@...nel.org> wrote:
>
> 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?
No PMD level mappings now.

Huacai
>
> > 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.