Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
References: <20190424191440.170422-1-matthewgarrett@google.com>
 <20190424192812.GG19031@bombadil.infradead.org> <CACdnJutj4K1kQj7yXcCNVWM_hmrUwMfZ-JBi=FHkBvYFfbJNZA@mail.gmail.com>
 <20190424202006.GH19031@bombadil.infradead.org>
In-Reply-To: <20190424202006.GH19031@bombadil.infradead.org>
From:   Matthew Garrett <mjg59@google.com>
Date:   Wed, 24 Apr 2019 13:22:32 -0700
Message-ID: <CACdnJuup-y1xAO93wr+nr6ARacxJ9YXgaceQK9TLktE7shab1w@mail.gmail.com>
Subject: Re: [PATCH] mm: Allow userland to request that the kernel clear
 memory on release
To:     Matthew Wilcox <willy@infradead.org>
Cc:     linux-mm@kvack.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Wed, Apr 24, 2019 at 1:20 PM Matthew Wilcox <willy@infradead.org> wrote:
> It depends on the semantics you want.  There's no legacy code to
> worry about here.  I was seeing this as the equivalent of an atexit()
> handler; userspace is saying "When this page is unmapped, zero it".
> So it doesn't matter that somebody else might be able to reference it --
> userspace could have zeroed it themselves.

Mm ok that seems reasonable. I'll rework with that in mind.