lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <878rb01hxv.fsf@jogness.linutronix.de>
Date:   Fri, 28 Jul 2023 11:58:44 +0206
From:   John Ogness <john.ogness@...utronix.de>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH printk v2 2/8] printk: Provide debug_store() for nbcon
 debugging

On 2023-07-28, John Ogness <john.ogness@...utronix.de> wrote:
> +/*
> + * Define DEBUG_NBCON to allow for nbcon ownership transitions to be logged
> + * to the ringbuffer. The debug_store() macro only logs to the lockless
> + * ringbuffer and does not trigger any printing.
> + */
> +#undef DEBUG_NBCON
> +
> +#ifdef DEBUG_NBCON
> +/* Only write to ringbuffer. */
> +int __debug_store(const char *fmt, ...)
> +{
> +	va_list args;
> +	int r;
> +
> +	va_start(args, fmt);
> +	r = vprintk_store(2, 7, NULL, fmt, args);
> +	va_end(args);
> +
> +	return r;
> +}
> +#define debug_store(cond, fmt, ...)						\
> +	do {									\
> +		if (cond)							\
> +			__debug_store(pr_fmt("DEBUG: " fmt), ##__VA_ARGS__)	\

Missing a semi-colon here. Wrapping this with a do-while was a
last-minute change requested by checkpatch.pl. Probably nobody would
notice because you must manually define DEBUG_NBCON by changing the
source code. Fixed for v3 (assuming Petr allows me to keep this
debugging code in place).

> +	} while (0)
> +#else
> +#define debug_store(cond, fmt, ...)
> +#endif

John

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ