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Date:   Thu, 7 May 2020 09:50:21 +0900
From:   Tetsuo Handa <>
To:     Joe Perches <>
Cc:     Sergey Senozhatsky <>,
        Petr Mladek <>,
        Steven Rostedt <>,, Dmitry Safonov <>,
        Michal Hocko <>,
        Yafang Shao <>
Subject: Re: [PATCH] printk: Add loglevel for "do not print to consoles".

On 2020/05/07 0:26, Joe Perches wrote:
> On Wed, 2020-05-06 at 18:45 +0900, Tetsuo Handa wrote:
>> On 2020/04/28 20:33, Tetsuo Handa wrote:
>>> On 2020/04/27 15:21, Sergey Senozhatsky wrote:
>>>>> KERN_NO_CONSOLES is for type of messages where "saved for later analysis" is
>>>>> important but "printed for immediate notification" is not important.
>>>>> In other words, KERN_NO_CONSOLES is NOT for dying messages where "printed for
>>>>> immediate notification" is important.
>>>> per-console loglevel is a user configurable parameter.
>>>> KERN_NO_CONSOLES is a hard-coded policy.
>>> But given that whether to use KERN_NO_CONSOLES is configurable via e.g. sysctl,
>>> KERN_NO_CONSOLES will become a user configurable parameter. What's still wrong?
>> Any problems remaining?
> printk_get_level / printk_skip_level and the various
> uses of %pV using printk_get_level

Excuse me, but what do you mean?

I wish printk() accepts "loglevel" argument detached from "fmt" argument (e.g.

  int printkl(int loglevel, const char *fmt_without_loglevel, ...);
  int vprintkl(int loglevel, const char *fmt_without_loglevel, va_list args);

) so that users of KERN_NO_CONSOLES need not to do like

  if (sysctl_no_console_for_XX)
    printk(KERN_INFO KERN_NO_CONSOLES pr_fmt(fmt) "%s\n", "hello");
    printk(KERN_INFO pr_fmt(fmt) "%s\n", "hello");


  printk("%s" pr_fmt(fmt) "%s\n", sysctl_no_console_for_XX ? KERN_INFO KERN_NO_CONSOLES : KERN_INFO, "hello");

in order to conditionally embed KERN_NO_CONSOLES into

  pr_info("%s\n", "hello");

. But this patch is about whether KERN_NO_CONSOLES is acceptable. How to
pass KERN_NO_CONSOLES (if KERN_NO_CONSOLES is acceptable) is a future patch.

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