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author | Ingo Molnar <mingo@elte.hu> | 2007-03-05 07:20:11 -0500 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-05 11:23:51 -0500 |
commit | 6ebf622b2577c50b1f496bd6a5e8739e55ae7b1c (patch) | |
tree | ae4da73844c08c9cfc6e934eabc55c1fb1188845 /drivers/video/imxfb.c | |
parent | 0d05ad2c09af9fb33ae76f9f8d1c4e4d1a9de92c (diff) |
[PATCH] disable NMI watchdog by default
there's a new NMI watchdog related problem: KVM crashes on certain
bzImages because ... we enable the NMI watchdog by default (even if the
user does not ask for it) , and no other OS on this planet does that so
KVM doesnt have emulation for that yet. So KVM injects a #GP, which
crashes the Linux guest:
general protection fault: 0000 [#1]
PREEMPT SMP
Modules linked in:
CPU: 0
EIP: 0060:[<c011a8ae>] Not tainted VLI
EFLAGS: 00000246 (2.6.20-rc5-rt0 #3)
EIP is at setup_apic_nmi_watchdog+0x26d/0x3d3
and no, i did /not/ request an nmi_watchdog on the boot command line!
Solution: turn off that darn thing! It's a debug tool, not a 'make life
harder' tool!!
with this patch the KVM guest boots up just fine.
And with this my laptop (Lenovo T60) also stopped its sporadic hard
hanging (sometimes in acpi_init(), sometimes later during bootup,
sometimes much later during actual use) as well. It hung with both
nmi_watchdog=1 and nmi_watchdog=2, so it's generally the fact of NMI
injection that is causing problems, not the NMI watchdog variant, nor
any particular bootup code.
[ NMI breaks on some systems, esp in combination with SMM -Arjan ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/imxfb.c')
0 files changed, 0 insertions, 0 deletions