linux-kernel - Re: [PATCH 1/2] printk: remove unused flag LOG

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Date:   Tue, 5 Jun 2018 14:56:09 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Maninder Singh <maninder1.s@...sung.com>,
        sergey.senozhatsky@...il.com, linux-kernel@...r.kernel.org,
        a.sahrawat@...sung.com, pankaj.m@...sung.com, v.narang@...sung.com
Subject: Re: [PATCH 1/2] printk: remove unused flag LOG_NOCONS

On Mon 2018-06-04 17:33:42, Steven Rostedt wrote:
> On Thu, 31 May 2018 14:16:33 +0200
> Petr Mladek <pmladek@...e.com> wrote:
> 
> > >  enum log_flags {
> > > -	LOG_NOCONS	= 1,	/* already flushed, do not print to console */
> > > -	LOG_NEWLINE	= 2,	/* text ended with a newline */
> > > -	LOG_PREFIX	= 4,	/* text started with a prefix */
> > > -	LOG_CONT	= 8,	/* text is a fragment of a continuation line */
> > > +	LOG_NEWLINE	= 1,	/* text ended with a newline */
> > > +	LOG_PREFIX	= 2,	/* text started with a prefix */
> > > +	LOG_CONT	= 4,	/* text is a fragment of a continuation line */
> > >  };  
> > 
> > Please, do not renumber the bits if there is no real need for it.
> > The format of the log buffer is read also by external tool like
> > "crash". It seems that "crash" ignores these flags but...
> 
> Then what's the problem for renumbering? I've renumbered internal flags
> before. No one complained about it.

Steven, did you renumber enum log_flags or flags in a different
subsystem?

Note that struct printk_log is a bit special because it is used by
the "crash" tool to implement the dmesg/log command. While "crash"
tool does not have special handling for most other internal
structures.

I have double checked "crash" sources and it ignores these flags
at the moment but it might change in the future => I suggest to
do not renumber them if there is not a real need.

Best Regards,
Petr