linux-kernel - Re: [PATCHv3 12/50] csky: Add show_stack

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Message-ID: <fb27b64b-f0a0-b969-40dc-578f24426e41@arista.com>
Date:   Mon, 18 May 2020 14:34:52 +0100
From:   Dmitry Safonov <dima@...sta.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Dmitry Safonov <0x7f454c46@...il.com>,
        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>,
        Guo Ren <guoren@...nel.org>
Subject: Re: [PATCHv3 12/50] csky: Add show_stack_loglvl()

Hi Andrew,

On 5/15/20 8:23 PM, Andrew Morton wrote:
> On Sat, 18 Apr 2020 21:19:06 +0100 Dmitry Safonov <dima@...sta.com> wrote:
> 
>> Currently, the log-level of show_stack() depends on a platform
>> realization. It creates situations where the headers are printed with
>> 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().
> 
> The csky code has changed a lot in linux-next due to 18c07d23da5a
> ("csky: Fixup calltrace panic").  I redid this patch as below.  Can we
> please review and test?

The result looks good to me, thanks for the rebase!

Thanks,
          Dmitry