Re: [x86/mm/gup] 2947ba054a [ 71.329069] kernel BUG at include/linux/pagemap.h:151!

[Peter Zijlstra]

On Fri, Mar 24, 2017 at 01:24:36PM +0300, Kirill A. Shutemov wrote:

> I'm not sure what is the best way to fix this.
> Few options:
>  - Drop the VM_BUG();
>  - Bump preempt count during __get_user_pages_fast();
>  - Use get_page() instead of page_cache_get_speculative() on x86.
> 
> Any opinions?

I think I'm in favour of the first; either remove or amend to include
irqs_disabled() or so.

This in favour of keeping the variants of GUP down.