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Date:   Sun, 20 Dec 2020 01:18:35 +0000
From:   Matthew Wilcox <>
To:     Vitaly Wool <>
Cc:     Mike Galbraith <>,
        LKML <>,
        linux-mm <>,
        Barry Song <>,
        Sebastian Andrzej Siewior <>,
        Minchan Kim <>,
        NitinGupta <>
Subject: Re: [PATCH] zsmalloc: do not use bit_spin_lock

On Sun, Dec 20, 2020 at 02:22:28AM +0200, Vitaly Wool wrote:
> zsmalloc takes bit spinlock in its _map() callback and releases it
> only in unmap() which is unsafe and leads to zswap complaining
> about scheduling in atomic context.
> To fix that and to improve RT properties of zsmalloc, remove that
> bit spinlock completely and use a bit flag instead.

Isn't this just "I open coded bit spinlock to make the lockdep
warnings go away"?

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