Re: [PATCH][RFC] preempt_count corruption across H_CEDE call with CONFIG_PREEMPT on pseries
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2010-07-22 22:27:42
On Thu, 2010-07-22 at 11:24 -0700, Darren Hart wrote:
1) How can the preempt_count() get mangled across the H_CEDE hcall? 2) Should we call preempt_enable() in cpu_idle() prior to cpu_die() ?
The preempt count is on the thread info at the bottom of the stack. Can you check the stack pointers ? Cheers, Ben.