linux-kernel - Re: [PATCH] mm/swapfile: Do not sleep with a spin lock held

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Date:   Wed, 02 Dec 2020 18:39:06 -0500
From:   Qian Cai <qcai@...hat.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/swapfile: Do not sleep with a spin lock held

On Wed, 2020-12-02 at 15:15 -0800, Andrew Morton wrote:
> On Wed,  2 Dec 2020 10:15:49 -0500 Qian Cai <qcai@...hat.com> wrote:
> 
> > We can't call kvfree() with a spin lock held, so defer it.
> > 
> 
> Fixes: 873d7bcfd066 ("mm/swapfile.c: use kvzalloc for swap_info_struct
> allocatio
> n")
> 
> Do you think it's worth a cc:stable?  IOW, is this known to ever
> produce a warning?

Yes, it did trigger a might_sleep() warning.