linux-kernel - Re: [PATCH] printk: remove unnecessary kmalloc() from syslog during clear

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Date:   Tue, 26 Jun 2018 10:39:59 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Namit Gupta <gupta.namit@...sung.com>,
        linux-kernel@...r.kernel.org, pankaj.m@...sung.com,
        a.sahrawat@...sung.com, himanshu.m@...sung.com
Subject: Re: [PATCH] printk: remove unnecessary kmalloc() from syslog during
 clear

On Tue, 26 Jun 2018 14:43:32 +0200
Petr Mladek <pmladek@...e.com> wrote:

> On Mon 2018-06-25 23:44:07, Sergey Senozhatsky wrote:
> > On (06/25/18 10:37), Steven Rostedt wrote:  
> > > 
> > > Is IMHO rather ugly.  
> > 
> > Either way works for me. So I'll leave it to you and Petr to decide :)
> >   
> > > And the original patch has one more advantage. If buf and clear are
> > > both NULL/zero, we don't take any locks.  
> > 
> > But we never use syslog_print_all(buf = NULL, clear = false). It's either
> > NULL/true [move forward clear idx, do not copy to user], or !NULL/use defined
> > value [copy to user, move or don't move clear idx forward]  
> 
> Yup, I suggest the following version as a compromise. It has the code
> duplication but I agree that it is negligible. Otherwise, it looks
> cleaner.
> 

This looks fine. For proper history though, what I do in this case,
would be to make this into two patches. One with Namit's original
patch, and then a second that removes the code duplication (your patch).

-- Steve