From: Satyam Sharma Date: Wed, 24 Oct 2007 16:23:50 +0000 (+0200) Subject: sched: use show_regs() to improve __schedule_bug() output X-Git-Tag: v2.6.24-rc2~145^2~7 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=838225b48edc971620cbeb292034dabd2b0d7d1d;p=linux-2.6-omap-h63xx.git sched: use show_regs() to improve __schedule_bug() output A full register dump along with stack backtrace would make the "scheduling while atomic" message more helpful. Use show_regs() instead of dump_stack() for this. We already know we're atomic in here (that is why this function was called) so show_regs()'s atomicity expectations are guaranteed. Also, modify the output of the "BUG: scheduling while atomic:" header a bit to keep task->comm and task->pid together and preempt_count() after them. Signed-off-by: Satyam Sharma Signed-off-by: Ingo Molnar --- diff --git a/kernel/sched.c b/kernel/sched.c index af02a4de069..d1e6663d3ab 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -66,6 +66,7 @@ #include #include +#include /* * Scheduler clock - returns current time in nanosec units. @@ -3507,12 +3508,19 @@ EXPORT_SYMBOL(sub_preempt_count); */ static noinline void __schedule_bug(struct task_struct *prev) { - printk(KERN_ERR "BUG: scheduling while atomic: %s/0x%08x/%d\n", - prev->comm, preempt_count(), task_pid_nr(prev)); + struct pt_regs *regs = get_irq_regs(); + + printk(KERN_ERR "BUG: scheduling while atomic: %s/%d/0x%08x\n", + prev->comm, prev->pid, preempt_count()); + debug_show_held_locks(prev); if (irqs_disabled()) print_irqtrace_events(prev); - dump_stack(); + + if (regs) + show_regs(regs); + else + dump_stack(); } /*