linux-kernel - Re: [PATCH 2/2] mm: adds NOSIGBUS extension for out-of-band shmem read

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Message-ID: <CAHk-=wiNT0RhwHkLa14ts0PGQtVtDZbJniOQJ66wxzXz4Co2mw@mail.gmail.com>
Date:   Thu, 3 Jun 2021 12:12:14 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Ming Lin <mlin@...nel.org>, Simon Ser <contact@...rsion.fr>,
        Linux-MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH 2/2] mm: adds NOSIGBUS extension for out-of-band shmem read

On Thu, Jun 3, 2021 at 12:07 PM Hugh Dickins <hughd@...gle.com> wrote:
>
> But the point that we've arrived at, that I'm actually now fairly
> happy with, is do *not* permit MAP_NOSIGBUS on MAP_SHARED mappings.

Yeah, if that's sufficient, then that original patch should just work as-is.

But there was some reason why people didn't like that patch
originally, and I think it was literally about how it only worked on
private mappings (the "we don't have a flag for it in the vm_flags"
part was just a small detail.

I guess that objection ended up changing over time.

            Linus