Locking Convenctions

[Can Sar <csar@xxxxxxxxxxxx>]

Hi,

Is there some way to tell whether a function is always called with 
locks or whether it is allowed to sleep or not. Furthermore, is there 
some source to check whether a function will sleep or not? (A list of 
sleeping functions, etc.?)
I am wondering whether vmalloc and copy_to_user in particular can sleep 
(I'm pretty sure they both can), which would mean that they could not 
be called from the read and write function of a block device because 
the device spinlock is acquired before those functions are called.

Thanks,
Can Sar


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