On Tue, 18 Aug 2009, Kumar Gala wrote:
>
> For some reason __raw_spin_is_locked() has been returning false for the
> uni-processor, non-CONFIG_DEBUG_SPINLOCK. The UP + CONFIG_DEBUG_SPINLOCK
> handles this correctly.
>
> Found this by enabling CONFIG_DEBUG_VM on PPC and hitting always hitting
> a BUG_ON that was testing to make sure the pte_lock was held.
>
> Signed-off-by: Kumar Gala <[email protected]>
> ---
>
> Linus, a fix for 2.6.31
This really isn't all that clear.
The thing is, some people may assert that a lock is held, but others could
easily be looping until it's not held using something like
while (spin_is_locked(lock))
cpu_relax();
so it's hard to tell whether it should return true or false in the case
where spin-locking simply doesn't exist.
Linus
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