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Subject: Re: [PATCH v3] mm: Allow calling vfree() from non-schedulable context.
From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
References: <1490784712-4991-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp>
	<0065385b-8cf9-aec6-22bb-9e6d21501a8c@virtuozzo.com>
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Message-Id: <201703292341.AJG51076.JFSFOLOOMQHFtV@I-love.SAKURA.ne.jp>
Date: Wed, 29 Mar 2017 23:41:51 +0900
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To: mhocko@kernel.org, aryabinin@virtuozzo.com
Cc: akpm@linux-foundation.org, linux-mm@kvack.org, hpa@zytor.com, chris@chris-wilson.co.uk, hch@lst.de, mingo@elte.hu, jszhang@marvell.com, joelaf@google.com, joaodias@google.com, willy@infradead.org, tglx@linutronix.de

Michal Hocko wrote:
> On Wed 29-03-17 14:36:10, Andrey Ryabinin wrote:
> [...]
> > So I just get a better idea. How about just always deferring
> > __purge_vmap_area_lazy()?
> 
> I didn't get to look closer but from the high level POV this makes a lot
> of sense. __purge_vmap_area_lazy shouldn't be called all that often that
> the deferred mode would matter.

I tested this change and confirmed that warnings went away.
This change is simple enough to send to 4.10-stable and 4.11-rc.
If you are OK with this change, I'm OK with this change.

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