linux-kernel - Re: [PATCH 0/3] zram: Replace pr_* with dev

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Date:	Thu, 06 Aug 2015 18:17:31 -0700
From:	Joe Perches <joe@...ches.com>
To:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:	Salah Triki <salah.triki@....org>, minchan@...nel.org,
	ngupta@...are.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] zram: Replace pr_* with dev_*

On Fri, 2015-08-07 at 09:05 +0900, Sergey Senozhatsky wrote:
> On (08/07/15 00:03), Salah Triki wrote:
> > This patchset replaces pr_* with dev_*. dev_* attach kernel messages to the right
> > device. In addition, patchs 1 and 2 add to messages the values of variables that trigger 
> > errors.
[]
> I'd prefer to leave the messages the way they are. Changing anything
> visible to user space (api, eror codes, error messages, etc.) is a
> very risky business. You change the format of error messages and it
> smells like a big NO-NO.
> 
> 'zram: Cannot initialise lzo compressing backend'
> --> 'block zram0: Cannot initialise lzo compressing backend'
> 
> 
> And there are even more dramatic changes:
> "Cannot change max compression streams\n"
> --> "Cannot change max compression streams to %d\n"
> 
> "Can't change algorithm for initialized device\n"
> --> "Can't change algorithm to %s for initialized device\n"
> 
> 
> People already can have scripts doing `grep "zram:"` on dmesg or
> whatever. We cannot change this anymore.

That's not true at all.

Using grep on dmesg is specifically _not_ guaranteed
to remain stable between kernel versions.


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