linux-kernel - Re: [PATCH v3] printk: Add boottime and real timestamps

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Message-ID: <53cceba0-e02c-6e5e-6272-9edc63d17ac4@android.com>
Date:   Fri, 4 Aug 2017 09:42:18 -0700
From:   Mark Salyzyn <salyzyn@...roid.com>
To:     Prarit Bhargava <prarit@...hat.com>, linux-kernel@...r.kernel.org
Cc:     Jonathan Corbet <corbet@....net>, Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Christoffer Dall <cdall@...aro.org>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Joel Fernandes <joelaf@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Nicholas Piggin <npiggin@...il.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Olof Johansson <olof@...om.net>,
        Josh Poimboeuf <jpoimboe@...hat.com>, linux-doc@...r.kernel.org
Subject: Re: [PATCH v3] printk: Add boottime and real timestamps

On 08/03/2017 06:18 PM, Prarit Bhargava wrote:
> +	/*
> +	 * Only allow enabling and disabling of the current printk_time
> +	 * setting.  Changing it from one setting to another confuses
> +	 * userspace.
> +	 */
We should allow a debug option to permit this (but that can be a 
followup patch, do not stall this one on a wish-list item).
> +	if (printk_time_setting == PRINTK_TIME_DISABLE) {
> +		printk_time_setting = _printk_time;
> +	} else if ((printk_time_setting != _printk_time) &&
> +		   (_printk_time != 0)) {
> +		pr_warn("printk: timestamp can only be set to 0(disabled) or %d(%s) ",
trailing space? why did checkpatch.pl not find this for you? should be 
trailing newline.
> +			printk_time_setting,
> +			printk_time_str[printk_time_setting]);
> +		return -EINVAL;
> +	}
> +
> +	printk_time = _printk_time;
> +	pr_info("printk: timestamp set to %d(%s).",
missing trailing newline
> +		printk_time, printk_time_str[printk_time]);
> +	return 0;
> +}
-- Mark