linux-kernel - Re: [PATCH 0/1] RFC: Revamp admin-guide/tainted-kernels.rst to make it more comprehensible

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Message-ID: <e77c03ff-a84b-4020-34a4-fc9fa5f1eccb@infradead.org>
Date:   Thu, 20 Dec 2018 08:42:13 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Thorsten Leemhuis <linux@...mhuis.info>,
        Jonathan Corbet <corbet@....net>
Cc:     linux-doc@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/1] RFC: Revamp admin-guide/tainted-kernels.rst to make
 it more comprehensible

On 12/20/18 7:23 AM, Thorsten Leemhuis wrote:
> Hi! Am 17.12.18 um 22:06 schrieb Randy Dunlap:
>> On 12/17/18 10:24 AM, Jonathan Corbet wrote:
>>> Here's an idea if you feel like improving this: rather than putting an
>>> inscrutable program inline, add a taint_status script to scripts/ that
>>> prints out the status in fully human-readable form, with the explanation
>>> for every set bit.
>> And some people prefer not adding tools that use python, perl, etc.
> 
> Yeah, I know :-/ On twitter @apexo (thx!) suggested these two:
> 
> dc -e"[00000000000000]n2o$(cat /proc/sys/kernel/tainted)p"|fold
> -w1|tac|nl| grep  -m 18 '.'
> 
> (echo -n 000000000000000;(echo obase=2;cat
> /proc/sys/kernel/tainted)|bc)|fold -w1|tac|nl| grep -m 18 '.'
> 
> But it needs bc, which often is not installed by default  :-/ Any as you
> mentioned already: using Perl (
> 
> perl -e 'printf("%016b\n",<STDIN>)' < /proc/sys/kernel/tainted |fold
> -w1|tac|nl
> 
> ) also has it downsides. Having something that works in plain bash/sh
> would be great...
> 
> Nevertheless: I'm still inclined to put a one liner decode command into
> tainted-kernels.rst so people can decode the file easily even if they do
> not have attached script at hand.
> 
>> E.g., I use this shell script (named 'chktaint', which could probably
>> be done better):
> 
> Many thx. Find a slightly improved version attached that directly prints
> the reason. I assume that's more like what Jonathan had in mind. The
> script now is also capable of decoding a value retrieved from
> /proc/sys/kernel/tainted on another system.

Thorsten:

- drop the trailing spaces on multiple lines
- s/follwing/following/


thanks.
-- 
~Randy