linux-kernel - Re: [PATCH 1/2] x86: stop using PER_CPU_VAR(kernel

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Message-ID: <20150323101815.35bd61c7@gandalf.local.home>
Date:	Mon, 23 Mar 2015 10:18:15 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>, Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] x86: stop using PER_CPU_VAR(kernel_stack)

On Sat, 21 Mar 2015 21:44:37 +0100
Denys Vlasenko <dvlasenk@...hat.com> wrote:

> Instead of PER_CPU_VAR(kernel_stack), 64-bit code
> can use PER_CPU_VAR(cpu_tss + TSS_sp0).

The change log here is lacking an answer to "why". It only states what
it does. What's wrong with using kernel_stack? The change log should
explicitly state that. I have no idea why this patch is needed.

-- Steve

> 
> 32-bit code switches to PER_CPU_VAR(cpu_current_top_of_stack),
> which has the same value.
> 

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