x86: Clear irqstack thread_info
x86: Clear irqstack thread_info

Mathias Merz reported that v2.6.37 failed to boot on his
system.

Make sure that the thread_info part of the irqstack is
initialized to zeroes.

Reported-and-Tested-by: Matthias Merz <ba324ca7b1c77fc20bb970d5aff6eea9377918a5@merz-ka.de>
Signed-off-by: Brian Gerst <e60badcb99f652a0bcc15460d39f7ea12d6655ee@gmail.com>
Acked-by: Pekka Enberg <add4fcd06328a394f0ad91feda7ee057316dc5ed@kernel.org>
Cc: Arjan van de Ven <9043bf4b08f6c93a2cb55d98c3494b123858348f@linux.intel.com>
Cc: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>
LKML-Reference: <809759dbb52fa8705aab7b840fcf54f0287fbb1e@mail.gmail.com>
Signed-off-by: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@elte.hu>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas