Re: [RFC PATCH V2 2/10] mm: expose is_mem_section_removable() symbol

[Michal Hocko]

On Tue 07-01-20 21:09:42, lantianyu1986@xxxxxxxxx wrote:
> From: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>
> 
> Hyper-V balloon driver will use is_mem_section_removable() to
> check whether memory block is removable or not when receive
> memory hot remove msg. Expose it.

I do not think this is a good idea. The check is inherently racy. Why
cannot the balloon driver simply hotremove the region when asked?
-- 
Michal Hocko
SUSE Labs