linux-kernel - Re: [PATCH v2 03/44] x86/asm/head: rename 'stack_start' -> 'initial

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Date:	Fri, 5 Aug 2016 11:01:57 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Nilay Vaish <nilayvaish@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	"H . Peter Anvin" <hpa@...or.com>, x86 <x86@...nel.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	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>
Subject: Re: [PATCH v2 03/44] x86/asm/head: rename 'stack_start' ->
 'initial_stack'

On Fri, Aug 05, 2016 at 10:28:39AM -0500, Nilay Vaish wrote:
> On 4 August 2016 at 17:21, Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> > The 'stack_start' variable is similar in usage to 'initial_code' and
> > 'initial_gs': they're all stored in head_64.S and they're all updated by
> > SMP and ACPI suspend before starting a CPU.
> >
> > Rename it to 'initial_stack' to be consistent with the others.
> >
> 
> May be change the following line as well:
> 
> ./arch/x86/kernel/head_64.S:69:     * Setup stack for verify_cpu().
> "-8" because stack_start is defined

Ah, yeah, I missed that one.

And also, now that I see that comment, and the line below it:

  leaq    (__end_init_task - 8)(%rip), %rsp

The 8 should be changed to SIZEOF_PTREGS in a later patch
("x86/asm/head: standardize the end of the stack for idle tasks").

-- 
Josh