linux-kernel - Re: [PATCH] zsmalloc: Fix races between asynchronous zspage free and page migration

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Message-Id: <20220511134322.54c44cb0cdd17a0f7fd9f761@linux-foundation.org>
Date:   Wed, 11 May 2022 13:43:22 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Sultan Alsawaf <sultan@...neltoast.com>
Cc:     Minchan Kim <minchan@...nel.org>, stable@...r.kernel.org,
        Nitin Gupta <ngupta@...are.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] zsmalloc: Fix races between asynchronous zspage free
 and page migration

On Wed, 11 May 2022 12:50:20 -0700 Sultan Alsawaf <sultan@...neltoast.com> wrote:

> > Shouldn't the fix be Fixes: 77ff465799c6 ("zsmalloc: zs_page_migrate: skip
> > unnecessary loops but not return -EBUSY if zspage is not inuse)?
> > Because we didn't migrate ZS_EMPTY pages before.
> 
> Hi,
> 
> Yeah, 77ff465799c6 indeed seems like the commit that introduced the bug.

I updated the changelog, thanks.