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Ingo Molnar a9622f6219 [PATCH] x86_64: fix boot hang caused by CALGARY_IOMMU_ENABLED_BY_DEFAULT 
one of my boxes didnt boot the 2.6.20-rc1-rt0 kernel rpm, it hung during
early bootup. After an hour or two of happy debugging i narrowed it down
to the CALGARY_IOMMU_ENABLED_BY_DEFAULT option, which was freshly added
to 2.6.20 via the x86_64 tree and /enabled by default/.

commit bff6547bb6 claims:

    [PATCH] Calgary: allow compiling Calgary in but not using it by default

    This patch makes it possible to compile Calgary in but not use it by
    default. In this mode, use 'iommu=calgary' to activate it.

but the change does not actually practice it:

 config CALGARY_IOMMU_ENABLED_BY_DEFAULT
        bool "Should Calgary be enabled by default?"
        default y
        depends on CALGARY_IOMMU
        help
          Should Calgary be enabled by default? if you choose 'y', Calgary
          will be used (if it exists). If you choose 'n', Calgary will not be
          used even if it exists. If you choose 'n' and would like to use
          Calgary anyway, pass 'iommu=calgary' on the kernel command line.
          If unsure, say Y.

it's both 'default y', and says "If unsure, say Y". Clearly not a typo.

disabling this option makes my box boot again. The patch below fixes the
Kconfig entry. Grumble.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-21 00:08:28 -08:00
..
alpha [PATCH] fdtable: Make fdarray and fdsets equal in size 2006-12-10 09:57:22 -08:00
arm [ARM] 4062/1: S3C24XX: Anubis and Osiris shuld have CONFIG_PM_SIMTEC 2006-12-19 22:54:53 +00:00
arm26 [PATCH] getting rid of all casts of k[cmz]alloc() calls 2006-12-13 09:05:58 -08:00
avr32 Merge branch 'for-linus' of git://www.atmel.no/~hskinnemoen/linux/kernel/avr32 2006-12-11 18:28:59 -08:00
cris [PATCH] getting rid of all casts of k[cmz]alloc() calls 2006-12-13 09:05:58 -08:00
frv [PATCH] sysctl: remove unused "context" param 2006-12-10 09:55:41 -08:00
h8300 [PATCH] getting rid of all casts of k[cmz]alloc() calls 2006-12-13 09:05:58 -08:00
i386 PCI: Fix multiple problems with VIA hardware 2006-12-20 10:54:43 -08:00
ia64 [PATCH] getting rid of all casts of k[cmz]alloc() calls 2006-12-13 09:05:58 -08:00
m32r [PATCH] LOG2: Implement a general integer log2 facility in the kernel 2006-12-08 08:28:51 -08:00
m68k [PATCH] getting rid of all casts of k[cmz]alloc() calls 2006-12-13 09:05:58 -08:00
m68knommu [PATCH] LOG2: Implement a general integer log2 facility in the kernel 2006-12-08 08:28:51 -08:00
mips [PATCH] MIPS: Fix COW D-cache aliasing on fork 2006-12-13 09:27:08 -08:00
parisc [PATCH] getting rid of all casts of k[cmz]alloc() calls 2006-12-13 09:05:58 -08:00
powerpc Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/pci-2.6 2006-12-21 00:01:47 -08:00
ppc [PATCH] getting rid of all casts of k[cmz]alloc() calls 2006-12-13 09:05:58 -08:00
s390 [S390] Save prefix register for dump on panic 2006-12-15 17:18:27 +01:00
sh sh: Fixup SH-2 BUG() trap handling. 2006-12-12 09:11:45 +09:00
sh64 [PATCH] Generic ioremap_page_range: sh64 conversion 2006-12-08 08:28:52 -08:00
sparc [SPARC]: Make bitops use same spinlocks as atomics. 2006-12-17 16:18:47 -08:00
sparc64 [SPARC64]: Mirror x86_64's PERCPU_ENOUGH_ROOM definition. 2006-12-17 14:06:59 -08:00
um [PATCH] getting rid of all casts of k[cmz]alloc() calls 2006-12-13 09:05:58 -08:00
v850 kconfig: Standardize "depends" -> "depends on" in Kconfig files 2006-12-12 20:04:19 +01:00
x86_64 [PATCH] x86_64: fix boot hang caused by CALGARY_IOMMU_ENABLED_BY_DEFAULT 2006-12-21 00:08:28 -08:00
xtensa [PATCH] Xtensa: Add ktermios and minor filename fix 2006-12-13 09:05:50 -08:00