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How to handle VM_FAULT_SIGBUS from handle_mm_fault()?

Posted by Mark_P 
I'm trying to ready user pages from a kernel driver as a proof-of-concept project. The driver walks through the page table, resolving the PGD -> PTE for a given userspace pointer, and attempts to retrieve the page (via pte_page). At any point that the calls fail, a call into handle_mm_fault() is made to fault the missing page in. However, in some cases, the function returns VM_FAULT_SIGBUS.

AFAIK, that error code is a catch-all for all non-OOM errors. I'm having a hard time figuring out the reason for this error code. Does anyone know the best way to handle this error code?
Re: How to handle VM_FAULT_SIGBUS from handle_mm_fault()?
April 25, 2015 02:35AM
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