Re: [PATCH][RFC] preempt_count corruption across H_CEDE call with CONFIG_PREEMPT on pseries
From: Darren Hart <hidden>
Date: 2010-08-04 13:45:25
On 07/22/2010 03:25 PM, Benjamin Herrenschmidt wrote:
On Thu, 2010-07-22 at 11:24 -0700, Darren Hart wrote:quoted
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 ?
Hi Ben, sorry if I didn't get back to you on this already. I checked the stack pointer before and after the cede call and they match. -- Darren Hart IBM Linux Technology Center Real-Time Linux Team