LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Petr Mladek <pmladek@suse.com>
To: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Maninder Singh <maninder1.s@samsung.com>,
	sergey.senozhatsky@gmail.com, rostedt@goodmis.org,
	linux-kernel@vger.kernel.org, a.sahrawat@samsung.com,
	pankaj.m@samsung.com, v.narang@samsung.com
Subject: Re: [PATCH 2/2] printk: make sure to print log on console.
Date: Thu, 31 May 2018 14:21:12 +0200	[thread overview]
Message-ID: <20180531122112.bfeqtmwpl2qc67a5@pathway.suse.cz> (raw)
In-Reply-To: <20180531105215.GF477@jagdpanzerIV>

On Thu 2018-05-31 19:52:15, Sergey Senozhatsky wrote:
> On (05/31/18 15:49), Maninder Singh wrote:
> > 
> > This patch make sure printing of log if loglevel at time of storing
> > log is greater than current console loglevel.
> > 
> > @why
> > In case of async printk, printk thread can miss logs because it checks
> > current log level at time of console_unlock.
> 
> Upstream printk has no printing kthread. And we also run
> printk()->console_unlock() with disabled preemption.

Yes, the comment was wrong but the problem is real. The console
handling is asynchronous even without the kthread. The current
console_lock owner is responsible for handling messages also
from other CPUs.

Best Regards,
Petr

  reply	other threads:[~2018-05-31 12:21 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20180531102246epcas5p2f1cbc6ff217172e12e2f78bb88eb4a7e@epcas5p2.samsung.com>
2018-05-31 10:19 ` Maninder Singh
2018-05-31 10:52   ` Sergey Senozhatsky
2018-05-31 12:21     ` Petr Mladek [this message]
2018-06-01  4:40       ` Sergey Senozhatsky
2018-06-01  8:53         ` Petr Mladek
2018-06-01  9:09           ` Petr Mladek
2018-06-01  9:37             ` Sergey Senozhatsky
2018-06-01  9:18           ` Sergey Senozhatsky
     [not found]       ` <CGME20180531102246epcas5p2f1cbc6ff217172e12e2f78bb88eb4a7e@epcms5p5>
2018-06-01  8:42         ` Vaneet Narang
2018-06-01  9:34           ` Sergey Senozhatsky
2018-05-31 13:27   ` Petr Mladek

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20180531122112.bfeqtmwpl2qc67a5@pathway.suse.cz \
    --to=pmladek@suse.com \
    --cc=a.sahrawat@samsung.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=maninder1.s@samsung.com \
    --cc=pankaj.m@samsung.com \
    --cc=rostedt@goodmis.org \
    --cc=sergey.senozhatsky.work@gmail.com \
    --cc=sergey.senozhatsky@gmail.com \
    --cc=v.narang@samsung.com \
    --subject='Re: [PATCH 2/2] printk: make sure to print log on console.' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).