linux-kernel - Re: [PATCHv3 11/50] c6x: Add show_stack

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Date:   Sat, 25 Apr 2020 11:18:35 -0700
From:   Joe Perches <joe@...ches.com>
To:     Dmitry Safonov <dima@...sta.com>, linux-kernel@...r.kernel.org
Cc:     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>,
        Aurelien Jacquiot <jacquiot.aurelien@...il.com>,
        Mark Salter <msalter@...hat.com>, linux-c6x-dev@...ux-c6x.org
Subject: Re: [PATCHv3 11/50] c6x: Add show_stack_loglvl()

On Sat, 2020-04-18 at 21:19 +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
> lower log level or higher than the stacktrace (depending on
> a platform or user).
[]
> diff --git a/arch/c6x/kernel/traps.c b/arch/c6x/kernel/traps.c
[]
> @@ -344,12 +344,13 @@ asmlinkage int process_exception(struct pt_regs *regs)
>  
>  static int kstack_depth_to_print = 48;
>  
> -static void show_trace(unsigned long *stack, unsigned long *endstack)
> +static void show_trace(unsigned long *stack, unsigned long *endstack,
> +		       const char *loglvl)
>  {
>  	unsigned long addr;
>  	int i;
> 
> -	pr_debug("Call trace:");
> +	printk("%sCall trace:", loglvl);

These are not equivalent transforms as pr_debug
is compiled to nothing unless DEBUG is defined
or CONFIG_DYNAMIC_DEBUG is enabled.

Perhaps all the conversions should be checked
for these "not the same" object code changes.