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Date: Tue, 30 Oct 2018 11:03:51 -0700
From: Dave Hansen <>
To: Matthew Wilcox <>,
 Andy Lutomirski <>
Cc: Kees Cook <>, Peter Zijlstra <>,
 Igor Stoppa <>, Mimi Zohar <>,
 Dave Chinner <>, James Morris <>,
 Michal Hocko <>,
 Kernel Hardening <>,
 linux-integrity <>,
 linux-security-module <>,
 Igor Stoppa <>,
 Dave Hansen <>, Jonathan Corbet <>,
 Laura Abbott <>, Randy Dunlap <>,
 Mike Rapoport <>,
 "open list:DOCUMENTATION" <>,
 LKML <>, Thomas Gleixner <>
Subject: Re: [PATCH 10/17] prmem: documentation

On 10/30/18 10:58 AM, Matthew Wilcox wrote:
> Does this satisfy Igor's requirements?  We wouldn't be able to
> copy_to/from_user() while rare_mm was active.  I think that's a feature
> though!  It certainly satisfies my interests (kernel code be able to
> mark things as dynamically-allocated-and-read-only-after-initialisation)

It has to be more than copy_to/from_user(), though, I think.

rare_modify(q) either has to preempt_disable(), or we need to teach the
context-switching code when and how to switch in/out of the rare_mm.
preempt_disable() would also keep us from sleeping.

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