linux-kernel - Re: [PATCH 4/4] x86: Pass kernel thread parameters in fork

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Message-ID: <CALCETrWkfBFndmnAAmc087i0HuJ9xqe7ahfyi-66O7icbLH+gg@mail.gmail.com>
Date:	Sun, 22 May 2016 11:01:51 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Brian Gerst <brgerst@...il.com>
Cc:	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Borislav Petkov <bp@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 4/4] x86: Pass kernel thread parameters in fork_frame

On Sat, May 21, 2016 at 9:04 AM, Brian Gerst <brgerst@...il.com> wrote:
> Instead of setting up a fake pt_regs context, put the kernel thread
> function pointer and arg into the unused callee-restored registers
> of struct fork_frame.
>
> Signed-off-by: Brian Gerst <brgerst@...il.com>

Seems reasonable.  Can you make sure you explicitly test with
something that uses the usermodehelper mechanism?

--Andy