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

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Date:   Mon, 25 Jun 2018 23:44:07 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Petr Mladek <pmladek@...e.com>,
        Namit Gupta <gupta.namit@...sung.com>,
        sergey.senozhatsky@...il.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 (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]

	-ss