linux-kernel - Re: [PATCH v3 16/51] x86/32: put real return address on stack in entry code

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Message-ID: <CALCETrU8m-tAj52gidFjxZTeTHQoqXHNa0ERDnXDUn92tQ35xw@mail.gmail.com>
Date:	Sun, 14 Aug 2016 00:31:47 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	"H . Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Brian Gerst <brgerst@...il.com>,
	Kees Cook <keescook@...omium.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Byungchul Park <byungchul.park@....com>,
	Nilay Vaish <nilayvaish@...il.com>
Subject: Re: [PATCH v3 16/51] x86/32: put real return address on stack in
 entry code

On Fri, Aug 12, 2016 at 7:28 AM, Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> This standardizes the stacks of idle tasks to be consistent with other
> tasks on 32-bit.

It might be nice to stick a ud2 or 1: hlt; jmp 1b or similar
afterwards to make it clear that initial_code can't return.