linux-kernel - Re: kernel/fork.c:3088:2: warning: clone3() entry point is missing, please fix

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Message-ID: <5375b5bb7221cf878d1f93e60e72807f66e26154.camel@physik.fu-berlin.de>
Date: Mon, 30 Jun 2025 12:45:43 +0200
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Arnd Bergmann <arnd@...db.de>, kernel test robot <lkp@...el.com>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, linux-hexagon@...r.kernel.org, 
	sparclinux@...r.kernel.org, linux-sh@...r.kernel.org, Dinh Nguyen
	 <dinguyen@...nel.org>, Simon Schuster
	 <schuster.simon+binutils@...mens-energy.com>, Linux-Arch
	 <linux-arch@...r.kernel.org>, Christian Brauner <brauner@...nel.org>
Subject: Re: kernel/fork.c:3088:2: warning: clone3() entry point is missing,
 please fix

Hi Arnd,

On Mon, 2025-06-30 at 12:02 +0200, Arnd Bergmann wrote:
> Some architectures have custom calling conventions for the
> fork/vfork/clone/clone3 syscalls, e.g. to handle copying all the
> registers correctly when the normal syscall entry doesn't do that,
> or to handle the changing stack correctly.
> 
> I see that both sparc and hexagon have a custom clone() syscall,
> so they likely need a custom clone3() as well, while sh and
> nios2 probably don't.
> 
> All four would need a custom assembler implementation in userspace
> for each libc, in order to test the userspace calling the clone3()
> function. For testing the kernel entry point itself, see Christian's
> original test case[1].

Thanks for the explanation. So, I guess as long as a proposed implementation
of clone3() on sh would pass Arnd's test program, it should be good for merging?

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
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