linux-kernel - Re: [PATCH v2 7/7] bug: Move WARN_ON() "cut here" into exception handler

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Date:   Tue, 10 Sep 2019 01:05:39 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     20190819234111.9019-8-keescook@...omium.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        Peter Zijlstra <peterz@...radead.org>,
        Drew Davenport <ddavenport@...omium.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Feng Tang <feng.tang@...el.com>,
        Petr Mladek <pmladek@...e.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Borislav Petkov <bp@...e.de>,
        YueHaibing <yuehaibing@...wei.com>, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 7/7] bug: Move WARN_ON() "cut here" into exception
 handler

On (08/20/19 09:47), Kees Cook wrote:
[..]
> @@ -181,6 +181,15 @@ enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
>  		}
>  	}
>  
> +	/*
> +	 * BUG() and WARN_ON() families don't print a custom debug message
> +	 * before triggering the exception handler, so we must add the
> +	 * "cut here" line now. WARN() issues its own "cut here" before the
> +	 * extra debugging message it writes before triggering the handler.
> +	 */
> +	if ((bug->flags & BUGFLAG_NO_CUT_HERE) == 0)
> +		printk(KERN_DEFAULT CUT_HERE);

Shouldn't this be pr_warn() or pr_crit()?

	-ss