Using vmalloc in device driver code

[neha naik]

Hi All,
 From what i have learnt vmalloc requires a minor page fault to sync the
process page tables with the reference page tables. So, is it safe to use
memory already allocated by vmalloc in io context/device driver code
(especially when the io call has returned back to the device driver after
finishing io on the device). I know that in general it is better to use
kmalloc (for better efficiency  and so on....) but, i want to know if it is
inaccurate to use vmalloc in this particular case and why (in terms of
cannot service page faults in interrupt context etc)?

Thanks in advance for your help.

Regards,
Neha
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