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

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Message-ID: <20150807000520.GA1891@swordfish>
Date:	Fri, 7 Aug 2015 09:05:20 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Salah Triki <salah.triki@....org>
Cc:	minchan@...nel.org, ngupta@...are.org,
	sergey.senozhatsky.work@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] zram: Replace pr_* with dev_*

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.
> 

Hi,

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.

This potentially breaks things in user space. So, I NACK the change
set. Thanks.

Minchan, any opinion?

	-ss

> Salah Triki (3):
>   zram: Replace pr_info with dev_info in max_comp_streams_store
>   zram: Replace pr_info with dev_info in comp_algorithm_store
>   zram: Replace pr_* with dev_*
> 
>  drivers/block/zram/zram_drv.c | 34 ++++++++++++++++++++--------------
>  1 file changed, 20 insertions(+), 14 deletions(-)
> 
> -- 
> 1.9.1
> 
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