linux-kernel - [PATCH 0/2] nios2: Add architecture support for clone3

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Message-Id: <20250821-nios2-implement-clone3-v1-0-1bb24017376a@siemens-energy.com>
Date: Thu, 21 Aug 2025 13:27:36 +0200
From: Simon Schuster via B4 Relay <devnull+schuster.simon.siemens-energy.com@...nel.org>
To: Dinh Nguyen <dinguyen@...nel.org>, 
 Christian Brauner <brauner@...nel.org>, Arnd Bergmann <arnd@...db.de>, 
 Andrew Morton <akpm@...ux-foundation.org>, 
 David Hildenbrand <david@...hat.com>, 
 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>, 
 Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, 
 Juri Lelli <juri.lelli@...hat.com>, 
 Vincent Guittot <vincent.guittot@...aro.org>, 
 Dietmar Eggemann <dietmar.eggemann@....com>, 
 Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, 
 Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>, 
 Kees Cook <kees@...nel.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
 Simon Schuster <schuster.simon@...mens-energy.com>
Subject: [PATCH 0/2] nios2: Add architecture support for clone3

This series adds support for the clone3 system call to the nios2
architecture. This addresses the build-time warning "warning: clone3()
entry point is missing, please fix" introduced in 505d66d1abfb9
("clone3: drop __ARCH_WANT_SYS_CLONE3 macro"). The implementation passes
the relevant clone3 tests of kselftest when applied on top of
next-20250815:

	./run_kselftest.sh
	TAP version 13
	1..4
	# selftests: clone3: clone3
	ok 1 selftests: clone3: clone3
	# selftests: clone3: clone3_clear_sighand
	ok 2 selftests: clone3: clone3_clear_sighand
	# selftests: clone3: clone3_set_tid
	ok 3 selftests: clone3: clone3_set_tid
	# selftests: clone3: clone3_cap_checkpoint_restore
	ok 4 selftests: clone3: clone3_cap_checkpoint_restore

The series also includes a small patch to kernel/fork.c that ensures
that clone_flags are passed correctly on architectures where unsigned
long is insufficient to store the u64 clone_flags.

Signed-off-by: Simon Schuster <schuster.simon@...mens-energy.com>
---
Simon Schuster (2):
      copy_process: Handle architectures where sizeof(unsigned long) < sizeof(u64)
      nios2: implement architecture-specific portion of sys_clone3

 arch/nios2/include/asm/syscalls.h |  1 +
 arch/nios2/include/asm/unistd.h   |  2 --
 arch/nios2/kernel/entry.S         |  6 ++++++
 arch/nios2/kernel/syscall_table.c |  1 +
 kernel/fork.c                     | 10 +++++-----
 5 files changed, 13 insertions(+), 7 deletions(-)
---
base-commit: 1357b2649c026b51353c84ddd32bc963e8999603
change-id: 20250818-nios2-implement-clone3-7f252c20860b

Best regards,
-- 
Simon Schuster <schuster.simon@...mens-energy.com>