linux-kernel - Re: should there still be arch-specific 4KSTACKS support?

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Date:	Mon, 25 Jun 2012 16:44:37 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	"Robert P. J. Day" <rpjday@...shcourse.ca>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: should there still be arch-specific 4KSTACKS support?

On Sat, Jun 23, 2012 at 11:47:33AM -0400, Robert P. J. Day wrote:
> 
>   via some convoluted logic, i ended up doing the following search:
> 
> $ grep -r 4KSTACKS *
> arch/sh/configs/r7785rp_defconfig:CONFIG_4KSTACKS=y
> arch/sh/Kconfig.debug:config 4KSTACKS
> arch/sh/include/asm/thread_info.h:#if defined(CONFIG_4KSTACKS)
> arch/mn10300/include/asm/thread_info.h:#ifdef CONFIG_4KSTACKS
> arch/m68k/Kconfig.machine:config 4KSTACKS
> arch/m68k/configs/m5208evb_defconfig:# CONFIG_4KSTACKS is not set
> arch/m68k/configs/m5275evb_defconfig:# CONFIG_4KSTACKS is not set
> arch/m68k/configs/m5475evb_defconfig:# CONFIG_4KSTACKS is not set
> arch/m68k/include/asm/thread_info.h:#ifdef CONFIG_4KSTACKS
> arch/c6x/include/asm/thread_info.h:#ifdef CONFIG_4KSTACKS
> drivers/lguest/interrupts_and_traps.c:	 * Depending on the CONFIG_4KSTACKS option, the Guest can have one or
> kernel/lockdep.c:	 * hardirq contexts (such as on 4KSTACKS), so only
> $
> 
>   so even though 4KSTACKS support was officially removed in June of
> 2010:
> 
> $ git show dcfa7262
> 
> there's still traces of it, some of it obviously harmless, leftover
> cruft, but it would appear that both sh and m68k still provide a
> 4KSTACKS config option.
> 
>   how much of that can be tossed as useless?
> 
None. What x86 did with its implementation has no bearing on anyone else.

You can read the following for more information:

	http://lists.linuxfoundation.org/pipermail/ltsi-dev/2012-May/000099.html
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