linux-kernel - Re: [PATCH v2 13/44] x86/asm/head: remove useless zeroed word

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Date:	Fri, 5 Aug 2016 12:13:04 -0400
From:	Brian Gerst <brgerst@...il.com>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	"H . Peter Anvin" <hpa@...or.com>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Kees Cook <keescook@...omium.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Byungchul Park <byungchul.park@....com>
Subject: Re: [PATCH v2 13/44] x86/asm/head: remove useless zeroed word

On Thu, Aug 4, 2016 at 6:22 PM, Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> This zeroed word has no apparent purpose, so remove it.
>
> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> ---
>  arch/x86/kernel/head_64.S | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
> index 8822c20..ac6e27e 100644
> --- a/arch/x86/kernel/head_64.S
> +++ b/arch/x86/kernel/head_64.S
> @@ -326,7 +326,6 @@ ENDPROC(start_cpu0)
>         .quad   INIT_PER_CPU_VAR(irq_stack_union)
>         GLOBAL(initial_stack)
>         .quad  init_thread_union+THREAD_SIZE-8
> -       .word  0
>         __FINITDATA
>
>  bad_address:


FYI the word used to be the SS segment selector for the LSS
instruction, which isn't needed in 64-bit mode.

--
Brian Gerst