linux-kernel - Re: [bug] latest -git boot hang

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Date:	Sat, 11 Oct 2008 09:19:39 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Tejun Heo <tj@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Yinghai Lu <yinghai@...nel.org>
Subject: Re: [bug] latest -git boot hang


* Tejun Heo <tj@...nel.org> wrote:

> > It does sound like perhaps the option should be hidden more, if it's 
> > really only reasonably enabled for some very specialized distro 
> > debuggers, not normal kernel people.
> 
> Yeap, if fedora didn't work, I think it should be hidden.  Do we 
> already have place to hide things like this?

in my local testing i'm using simple annotations like the one attached 
further below. Any objections against sending my BROKEN_BOOT_ALLOWED kit 
upstream, and merge my annotations for various kernel features that 
break a generic distro bootup?

Right now i have about 40 such annotations for -tip testing:

  fs/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  fs/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  security/selinux/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  security/smack/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  security/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/net/appletalk/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/net/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/media/video/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/scsi/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/watchdog/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/watchdog/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/ide/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/i2c/busses/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/block/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/video/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/video/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/video/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/video/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/video/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/video/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/video/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/video/console/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/video/console/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/mtd/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  drivers/isdn/icn/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  lib/Kconfig.kgdb:	depends on BROKEN_BOOT_ALLOWED
  lib/Kconfig.debug:	depends on BROKEN_BOOT_ALLOWED
  lib/Kconfig.debug:	depends on BROKEN_BOOT_ALLOWED
  arch/x86/Kconfig.debug:	depends on BROKEN_BOOT_ALLOWED
  arch/x86/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  arch/x86/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  arch/x86/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  arch/x86/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  arch/x86/Kconfig:	# depends on BROKEN_BOOT_ALLOWED
  arch/x86/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  arch/x86/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  arch/x86/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  arch/x86/Kconfig:	depends on BROKEN_BOOT_ALLOWED
  arch/x86/Kconfig.cpu:	depends on BROKEN_BOOT_ALLOWED

and note the stark contrast to CONFIG_BROKEN - sometimes a given 
functionality is really not meant to be enabled on a generic system.

	Ingo

---------------->
Subject: qa: no ext devt
From: Ingo Molnar <mingo@...e.hu>
Date: Fri Oct 10 22:54:57 CEST 2008

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 lib/Kconfig.debug |    2 ++
 1 file changed, 2 insertions(+)

Index: linux/lib/Kconfig.debug
===================================================================
--- linux.orig/lib/Kconfig.debug
+++ linux/lib/Kconfig.debug
@@ -670,6 +670,8 @@ config DEBUG_BLOCK_EXT_DEVT
         bool "Force extended block device numbers and spread them"
 	depends on DEBUG_KERNEL
 	depends on BLOCK
+	depends on BROKEN_BOOT_ALLOWED
+	select BROKEN_BOOT
 	default n
 	help
 	  Conventionally, block device numbers are allocated from

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