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

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Message-ID: <alpine.DEB.2.02.1206231142150.14887@oneiric>
Date:	Sat, 23 Jun 2012 11:47:33 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...shcourse.ca>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: should there still be arch-specific 4KSTACKS support?


  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?

rday

-- 

========================================================================
Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
========================================================================

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