tree 0c8982c11cd410f4b654b8fda9a1a1fc6776e4a3
parent e523d93c8487667552dd29ff756d6ea6bce30851
author Hideo Saito <saito@densan.co.jp> 1172655342 +0900
committer Paul Mundt <lethal@linux-sh.org> 1173071606 +0900

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>