From e6bcf562e58662b9765748d346e4c076b20e3aa5 Mon Sep 17 00:00:00 2001 From: Hideo Saito Date: Wed, 28 Feb 2007 18:35:42 +0900 Subject: 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 Signed-off-by: Paul Mundt --- arch/sh/kernel/process.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'arch') diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c index 9d6a438..e760736 100644 --- a/arch/sh/kernel/process.c +++ b/arch/sh/kernel/process.c @@ -250,12 +250,11 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, childregs->regs[15] = usp; ti->addr_limit = USER_DS; } else { - childregs->regs[15] = (unsigned long)task_stack_page(p) + - THREAD_SIZE; + childregs->regs[15] = (unsigned long)childregs; ti->addr_limit = KERNEL_DS; } - if (clone_flags & CLONE_SETTLS) + if (clone_flags & CLONE_SETTLS) childregs->gbr = childregs->regs[0]; childregs->regs[0] = 0; /* Set return value for child */ -- cgit v1.1