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

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Date:   Sun, 25 Sep 2022 13:00:49 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     wangyong <yongw.pur@...il.com>
Cc:     jaewon31.kim@...sung.com, linux-kernel@...r.kernel.org,
        mhocko@...nel.org, stable@...r.kernel.org, wang.yong12@....com.cn,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Minchan Kim <minchan@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v2 stable-4.19 1/3] mm/page_alloc: use ac->high_zoneidx
 for classzone_idx

On Sun, Sep 25, 2022 at 03:35:27AM -0700, wangyong wrote:
> From: Joonsoo Kim <iamjoonsoo.kim@....com>
> 
> [ 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