On Wed, 26 Feb 2014 12:25:53 +0530
doug lkml <doug.lkml@xxxxxxxxx> wrote:
> for example
>
> __might_sleep
> rt_spin_lock
> some_fucnction() --> which has a
> local_irq_save(flags)/local_irq_irqrestore(flags).
>
> This could be a potential bug right?
Not that I see.
In -rt, we convert all spin_locks() into rt_mutex() which means they
might sleep on contention. We do not convert raw_spin_locks(), they
stay the same both in mainline and -rt.
The following is OK:
rt_mutex()
__might_sleep()
some_function()
local_irq_save()
local_irq_restore()
Indention show what calls what.
But if you have:
local_irq_save()
some_function();
rt_mutex();
local_irq_restore();
Now the above *is* a bug.
Is that what you are asking?
-- Steve
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