linux-kernel - Re: [PATCHv3 24/50] openrisc: Add show_stack

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Message-ID: <20200419205728.GT7926@lianli.shorne-pla.net>
Date:   Mon, 20 Apr 2020 05:57:28 +0900
From:   Stafford Horne <shorne@...il.com>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     linux-kernel@...r.kernel.org,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>, Jiri Slaby <jslaby@...e.com>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        openrisc@...ts.librecores.org
Subject: Re: [PATCHv3 24/50] openrisc: Add show_stack_loglvl()

On Sat, Apr 18, 2020 at 09:19:18PM +0100, Dmitry Safonov wrote:
> Currently, the log-level of show_stack() depends on a platform
> realization. It creates situations where the headers are printed with

Instead of realization I would say "Implementation".

> lower log level or higher than the stacktrace (depending on
> a platform or user).
> 
> Furthermore, it forces the logic decision from user to an architecture
> side. In result, some users as sysrq/kdb/etc are doing tricks with
> temporary rising console_loglevel while printing their messages.
> And in result it not only may print unwanted messages from other CPUs,
> but also omit printing at all in the unlucky case where the printk()
> was deferred.
> 
> Introducing log-level parameter and KERN_UNSUPPRESSED [1] seems
> an easier approach than introducing more printk buffers.
> Also, it will consolidate printings with headers.
> 
> Introduce show_stack_loglvl(), that eventually will substitute
> show_stack().

Will you do the work to replace show_stack(), when is that planned?

Other than that small comment this looks fine.

Acked-by: Stafford Horne <shorne@...il.com>


> Cc: Jonas Bonn <jonas@...thpole.se>
> Cc: Stafford Horne <shorne@...il.com>
> Cc: Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
> Cc: openrisc@...ts.librecores.org
> [1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@arista.com/T/#u
> Signed-off-by: Dmitry Safonov <dima@...sta.com>