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Date: Fri, 31 May 2019 18:18:32 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Alexander Potapenko <glider@...gle.com>
Cc: Christoph Lameter <cl@...ux.com>, Kees Cook <keescook@...omium.org>,
 Dmitry Vyukov <dvyukov@...gle.com>, James Morris <jmorris@...ei.org>, Jann
 Horn <jannh@...gle.com>, Kostya Serebryany <kcc@...gle.com>, Laura Abbott
 <labbott@...hat.com>, Mark Rutland <mark.rutland@....com>, Masahiro Yamada
 <yamada.masahiro@...ionext.com>, Matthew Wilcox <willy@...radead.org>, Nick
 Desaulniers <ndesaulniers@...gle.com>, Randy Dunlap
 <rdunlap@...radead.org>, Sandeep Patil <sspatil@...roid.com>,
 "Serge E. Hallyn" <serge@...lyn.com>, Souptick Joarder
 <jrdr.linux@...il.com>, Marco Elver <elver@...gle.com>,
 kernel-hardening@...ts.openwall.com, linux-mm@...ck.org,
 linux-security-module@...r.kernel.org
Subject: Re: [PATCH v5 2/3] mm: init: report memory auto-initialization
 features at boot time

On Wed, 29 May 2019 14:38:11 +0200 Alexander Potapenko <glider@...gle.com> wrote:

> Print the currently enabled stack and heap initialization modes.
> 
> The possible options for stack are:
>  - "all" for CONFIG_INIT_STACK_ALL;
>  - "byref_all" for CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL;
>  - "byref" for CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF;
>  - "__user" for CONFIG_GCC_PLUGIN_STRUCTLEAK_USER;
>  - "off" otherwise.
> 
> Depending on the values of init_on_alloc and init_on_free boottime
> options we also report "heap alloc" and "heap free" as "on"/"off".

Why?

Please fully describe the benefit to users so that others can judge the
desirability of the patch.  And so they can review it effectively, etc.

Always!

> In the init_on_free mode initializing pages at boot time may take some
> time, so print a notice about that as well.

How much time?

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