Re: [PATCH] rwlock_is_locked undefined for UP systems

[Christoph Hellwig]

On Fri, Jan 16, 2004 at 07:15:11PM +0530, Prashanth T wrote:
> Hi,
>     I had to use rwlock_is_locked( ) with linux2.6 for kdb and noticed that
> this routine to be undefined for UP.  I have attached the patch for 2.6.1
> below to return 0 for rwlock_is_locked( ) on UP systems.
> Please let me know.

we don't implement spin_is_locked on UP either because there's no really
usefull return value.  The lock will never be taken on !SMP && !PREEMPT,
but OTOH it's also not needed, so any assert on will give false results.
And the assert is probably the only thing that the _is_locked routines
could used for sanely.

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