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From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Petr Mladek <pmladek@suse.com>,
	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	linux-kernel@vger.kernel.org,
	Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH v1] printk: Declare log_wait as external variable
Date: Tue, 4 Feb 2020 11:16:20 +0900	[thread overview]
Message-ID: <20200204021620.GD41358@google.com> (raw)
In-Reply-To: <20200203131528.52825-1-andriy.shevchenko@linux.intel.com>

On (20/02/03 15:15), Andy Shevchenko wrote:
> Static analyzer is not happy:
> 
> kernel/printk/printk.c:421:1: warning: symbol 'log_wait' was not declared. Should it be static?
> 
> This is due to usage of log_wait in the other module without announcing
> its declaration to the world. I wasn't able to dug into deep history of
> reasons why it is so, and thus decide to make less invasive change, i.e.
> declaring log_wait as external variable to make static analyzer happy.

[..]

> diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
> index 633f41a11d75..43b5cb88c607 100644
> --- a/kernel/printk/printk.c
> +++ b/kernel/printk/printk.c
> @@ -418,7 +418,14 @@ DEFINE_RAW_SPINLOCK(logbuf_lock);
>  	} while (0)
>
>  #ifdef CONFIG_PRINTK
> +
> +#ifdef CONFIG_PROC_FS
> +extern wait_queue_head_t log_wait;	/* Used in fs/proc/kmsg.c */
>  DECLARE_WAIT_QUEUE_HEAD(log_wait);
> +#else
> +static DECLARE_WAIT_QUEUE_HEAD(log_wait);
> +#endif /* CONFIG_PROC_FS */

[..]

Since we are now introducing CONFIG_PROC_FS dependency to printk (and
proc/kmsg already has CONFIG_PRINTK dependency), then I guess I wouldn't
mind it if fs/proc/kmsg would just relocate to printk, next to devksmg
implementation. Just saying.

	-ss

  reply	other threads:[~2020-02-04  2:16 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-03 13:15 [PATCH v1] printk: Declare log_wait as external variable Andy Shevchenko
2020-02-04  2:16 ` Sergey Senozhatsky [this message]
2020-02-04  9:05   ` Andy Shevchenko
2020-02-04 11:22     ` Sergey Senozhatsky
2020-02-04 11:31       ` Andy Shevchenko
2020-02-11 12:43 ` Petr Mladek
2020-02-12  1:31   ` Sergey Senozhatsky
2020-02-12 14:03     ` Petr Mladek
2020-02-12 14:24       ` John Ogness
2020-02-13 12:02         ` Sergey Senozhatsky

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