Re: [PATCH] mm: use a irq-safe __mod_zone_page_state in mlocked_vma_newpage()

[Christoph Lameter]

On Sat, 10 May 2014, Jianyu Zhan wrote:

> mlocked_vma_newpage() is only called in fault path by
> page_add_new_anon_rmap(), which is called on a *new* page.
> And such page is initially only visible via the pagetables, and the
> pte is locked while calling page_add_new_anon_rmap(), so we need not
> use an irq-safe mod_zone_page_state() here, using a light-weight version
> __mod_zone_page_state() would be OK.

This has nothing to do with the safety of statistics operations that work
on different data structures. Which leads to the conclusion that
__mod_page_state cannot be used here.


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