From: Hideo Saito <saito@densan.co.jp>
Date: Wed, 28 Feb 2007 09:35:42 +0000 (+0900)
Subject: sh: Fix kernel thread stack corruption with preempt.
X-Git-Tag: v2.6.21-rc4~104^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e6bcf562e58662b9765748d346e4c076b20e3aa5;p=pandora-kernel.git

sh: Fix kernel thread stack corruption with preempt.

When I run a preemptive kernel-2.6.20 for SH7780, a created
kthread(pdflush) can not exit by do_exit() in kernel_thread_helper. I
think that the created kthread should have a room for 'struct pt_regs'
space on the stack top, because __switch_to() will refer to the space as
follows using 'regs = task_pt_regs(prev)' and next condition may be true.

Signed-off-by: Hideo Saito <saito@densan.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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