Re: owner field in `struct fs'

[Philipp Rumpf]

On Sat, Jun 24, 2000 at 09:38:22PM +0100, Alan Cox wrote:
> 	CPU1			CPU2
> 
> 	down(&lock)
> 				rmmod
> 
> 	freeze			freeze
> 
> 				cleanup_module
> 				down(&lock)
> 
> Now either #1 freeze yields in this case which is the existing behaviour with
> a lot of do nothing code added or it keeps CPU1 frozen in which case you are
> screwed.
> 
> Or am I missing something

CPU1's old thread gets rescheduled on CPU2 (CPU1 stays frozen), eventually
returns to userspace, CPU2 gets rescheduled after the down(&lock) in
cleanup_module, cleanup_module finishes.

Note this is completely equivalent to UP

thread a			thread b
down(&lock);
schedule();
				rmmod
				cleanup_module
				down(&lock)

	Philipp