Re: [PATCH v2 stable-4.19 1/3] mm/page_alloc: use ac->high_zoneidx for classzone_idx

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On Sun, Sep 25, 2022 at 03:35:27AM -0700, wangyong wrote:
> From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
> 
> [ backport of commit 3334a45eb9e2bb040c880ef65e1d72357a0a008b ]

This is from 5.8.  What about the 5.4.y kernel?  Why would someone
upgrading from 4.19.y to 5.4.y suffer a regression here?

And why wouldn't someone who has this issue just not use 5.10.y instead?
What prevents someone from moving off of 4.19.y at this point in time?

thanks,

greg k-h



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