NUMA memchr_inv() in mm/vmstat.c:need_update()?

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To: <linux-mm@xxxxxxxxx>
Subject: NUMA memchr_inv() in mm/vmstat.c:need_update()?
From: Janne Huttunen <janne.huttunen@xxxxxxxxx>
Date: Fri, 2 Nov 2018 14:44:11 +0200

Hi,

The commit 1d90ca897 changed the type of the vm_numa_stat_diff
from s8 into u16. It also changed the associated BUILD_BUG_ON()
in need_update(), but didn't touch the memchr_inv() call after
it. Is the memchr_inv() call still supposed to cover the whole
array or am I just misreading the code?

Follow-Ups:
- Re: NUMA memchr_inv() in mm/vmstat.c:need_update()?
  - From: Michal Hocko

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