Hello all,

I am trying to allocate a new block of memory for an array using vmalloc_user(), but it only works when I allocate memory in the module initialization function.

Durring module initialization I register a funcion using dev_add_pack(), and that function tried to allocate some memory using vmalloc_user(), but it causes the system to crash.

I have done some additinal testing, and found that kcalloc() works fine outside of the module initialization function. I am going to need more memory that kcalloc() or kmalloc() can assign. I belive the limit is 128KB. So is there any reason why vmalloc_user() would not work after module initialization?

Thanks.

I might have found the answer to why vmalloc() fails after module initialization.
http://forum.soft32.com/linux2/kmall...pict16337.html

Acording to that post vmalloc() can sleep, and thats fine in the module initialization function(process context), but not in a function executed by dev_add_pack() (interupt context) because it can sleep. That would explain why vmalloc worked in init, but caused the crash later.