On Monday 14 February 2005 12:48, Anton Altaparmakov wrote:
> Hi,
>
> I get a few Debug messages of the form from UML:
>
> Debug: sleeping function called from invalid context at
> include/asm/arch/semaphore.h:107
> in_atomic():0, irqs_disabled():1
> Call Trace:
> 087d77b0:  [<0809aaa5>] __might_sleep+0x135/0x180
> 087d77d8:  [<084d377f>] mcount+0xf/0x20
> 087d77e0:  [<0807cc13>] uml_console_write+0x33/0x80

> Most are coming via uml_console_write.
The problem is that the UML tty drivers use a semaphore instead of a spinlock 
for the locking, which also causes some other problems.

The attached patch should fix this, but I've not yet made sure it is not 
deadlock-prone (I didn't hit any during some very limited testing).

So it's not yet ready for 2.6.11.
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade