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

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Message-ID: <CAMzpN2gVTTfGLoAZR3w0ofST8FrmPtiXYCAq4b6xvkyJbKAfiA@mail.gmail.com>
Date:	Sun, 22 May 2016 15:21:40 -0400
From:	Brian Gerst <brgerst@...il.com>
To:	Andy Lutomirski <luto@...capital.net>
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 Sun, May 22, 2016 at 2:01 PM, Andy Lutomirski <luto@...capital.net> wrote:
> 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

kernel_init() does the same thing to spawn init, so it wouldn't boot otherwise.

--
Brian Gerst