[RESEND PATCH] ARM: fix 'unannotated irqs-on' lockdep warning
Russell King - ARM Linux
linux at arm.linux.org.uk
Sun May 23 10:13:01 EDT 2010
On Sun, May 23, 2010 at 09:44:20PM +0800, Ming Lei wrote:
> 2010/5/23 Russell King - ARM Linux <linux at arm.linux.org.uk>:
> >> ENTRY(ret_to_user)
> >> ret_slow_syscall:
> >> - disable_irq @ disable interrupts
> >> + disable_irq_notrace @ disable interrupts
> >
> > I think this one does need to be traced - the pending work functions are
> > all C code which could call back into lockdep.
>
> If there are pending works, schedule will be called to give cpu to it,
> I wonder why the work function to be scheduled will be run with irq
> disabled. Seems we should enable irq again before calling schedule,
> not sure.
No. I'm talking about things like do_notify_resume().
I think the above should be left as-is, so that as far as lockdep is
concerned, IRQs are off while userspace runs. What happens between
returning to userspace and re-entering the kernel has no bearing what
so ever on lockdep.
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