linux-kernel - Re: [PATCH 10/17] prmem: documentation

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Message-ID: <42e65f5f-2753-54a7-08a4-b51e56dfedbe@gmail.com>
Date:   Wed, 24 Oct 2018 17:30:52 +0300
From:   Igor Stoppa <igor.stoppa@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Kees Cook <keescook@...omium.org>,
        Matthew Wilcox <willy@...radead.org>,
        Dave Chinner <david@...morbit.com>,
        James Morris <jmorris@...ei.org>,
        Michal Hocko <mhocko@...nel.org>,
        kernel-hardening@...ts.openwall.com,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org
Cc:     igor.stoppa@...wei.com, Dave Hansen <dave.hansen@...ux.intel.com>,
        Jonathan Corbet <corbet@....net>,
        Laura Abbott <labbott@...hat.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/17] prmem: documentation

Hi,

On 24/10/18 06:48, Randy Dunlap wrote:
> Hi,
> 
> On 10/23/18 2:34 PM, Igor Stoppa wrote:

[...]

>> +- The present document doesn't address such transient.
> 
>                                                 transience.

ok

[...]

>> +   are attempted after the write protection is in place, will cause
> 
> no comma.

ok

[...]

>> +        - Its usefulness depends on the specific use case at hand
> 
> end above sentence with a period, please, like all of the others above it.

ok


>> +    - The "START_WR" mode is the only one which provides immediate protection, at the cost of speed.
> 
> Please try to keep the line above and a few below to < 80 characters in length.
> (because some of us read rst files as text files, with a text editor, and line
> wrap is ugly)

ok, I still have to master .rst :-(

[...]

>> +- The users of rare write must take care of ensuring the atomicity of the
> 
> s/rare write/write rare/ ?

thanks

>> +  action, respect to the way they use the data being altered; for example,
> 
>    This ..   "respect to the way" is awkward, but I don't know what to
> change it to.
> 
>> +  take a lock before making a copy of the value to modify (if it's
>> +  relevant), then alter it, issue the call to rare write and finally
>> +  release the lock. Some special scenario might be exempt from the need
>> +  for locking, but in general rare-write must be treated as an operation
> 
> It seemed to me that "write-rare" (or write rare) was the going name, but now
> it's being called "rare write" (or rare-write).  Just be consistent, please.


write-rare it is, because it can be shortened as wr_xxx

rare_write becomes rw_xxx

which wrongly hints at read/write, which it definitely is not

>> +  tlb entries. It still does a better job of it, compared to invoking
> 
>       TLB

ok

>> +  vmalloc for each allocation, but it is undeniably less optimized wrt to
> 
> s/wrt/with respect to/

yes

> Thanks for the documentation.

thanks for the review :-)

--
igor