linux-kernel - Re: [PATCH RFC V2 16/17] [dax|pmem]: Enable stray write protection

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Message-ID: <20200717092507.GE10769@hirez.programming.kicks-ass.net>
Date:   Fri, 17 Jul 2020 11:25:07 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     ira.weiny@...el.com
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH RFC V2 16/17] [dax|pmem]: Enable stray write protection

On Fri, Jul 17, 2020 at 12:20:55AM -0700, ira.weiny@...el.com wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> Protecting against stray writes is particularly important for PMEM
> because, unlike writes to anonymous memory, writes to PMEM persists
> across a reboot.  Thus data corruption could result in permanent loss of
> data.  Therefore, there is no option presented to the user.
> 
> Enable stray write protection by setting the flag in pgmap which
> requests it.  Note if Zone Device Access Protection not be supported
> this flag will have no affect.

The actual implementation is stray-access-protection, as noted ealier.
This inconsisteny is throughout.