linux-kernel - Re: [PATCH] printk: Make it compile with !CONFIG

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Date:	Thu, 15 Mar 2012 08:44:21 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] printk: Make it compile with !CONFIG_PRINTK

On 03/15/2012 04:35 AM, Peter Zijlstra wrote:

> On Thu, 2012-03-15 at 07:19 +1100, Stephen Rothwell wrote:
>> On Wed, 14 Mar 2012 08:56:22 -0700 Randy Dunlap <rdunlap@...otime.net> wrote:
>>>
>>> on x86_64:
>>>
>>> kernel/printk.c:1230:5: error: redefinition of 'printk_sched'
>>> include/linux/printk.h:136:5: note: previous definition of 'printk_sched' was here
>>
>> Caused by commit 3ccf3e830615 ("printk/sched: Introduce special
>> printk_sched() for those awkward moments") from the tip tree.  The
>> declaration in include/linux/printk.h has alternatives determined by
>> CONFIG_PRINTK, but the definition in kernel/printk.c is not so
>> protected ...
> 
> Ingo, could you stick this on top.. ?


Acked-by: Randy Dunlap <rdunlap@...otime.net>

Thanks.


> ---
> Subject: printk: Make it compile with !CONFIG_PRINTK
> 
> Commit 3ccf3e830615 ("printk/sched: Introduce special printk_sched() for
> those awkward moments") overlooked an #ifdef, so move code around to
> respect these directives.
> 
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> ---
>  kernel/printk.c |   40 ++++++++++++++++++++--------------------
>  1 files changed, 20 insertions(+), 20 deletions(-)
> 
> diff --git a/kernel/printk.c b/kernel/printk.c
> index 8b6981e..b663c2c 100644
> --- a/kernel/printk.c
> +++ b/kernel/printk.c
> @@ -1227,26 +1227,6 @@ int is_console_locked(void)
>  static DEFINE_PER_CPU(int, printk_pending);
>  static DEFINE_PER_CPU(char [PRINTK_BUF_SIZE], printk_sched_buf);
>  
> -int printk_sched(const char *fmt, ...)
> -{
> -	unsigned long flags;
> -	va_list args;
> -	char *buf;
> -	int r;
> -
> -	local_irq_save(flags);
> -	buf = __get_cpu_var(printk_sched_buf);
> -
> -	va_start(args, fmt);
> -	r = vsnprintf(buf, PRINTK_BUF_SIZE, fmt, args);
> -	va_end(args);
> -
> -	__this_cpu_or(printk_pending, PRINTK_PENDING_SCHED);
> -	local_irq_restore(flags);
> -
> -	return r;
> -}
> -
>  void printk_tick(void)
>  {
>  	if (__this_cpu_read(printk_pending)) {
> @@ -1663,6 +1643,26 @@ late_initcall(printk_late_init);
>  
>  #if defined CONFIG_PRINTK
>  
> +int printk_sched(const char *fmt, ...)
> +{
> +	unsigned long flags;
> +	va_list args;
> +	char *buf;
> +	int r;
> +
> +	local_irq_save(flags);
> +	buf = __get_cpu_var(printk_sched_buf);
> +
> +	va_start(args, fmt);
> +	r = vsnprintf(buf, PRINTK_BUF_SIZE, fmt, args);
> +	va_end(args);
> +
> +	__this_cpu_or(printk_pending, PRINTK_PENDING_SCHED);
> +	local_irq_restore(flags);
> +
> +	return r;
> +}
> +
>  /*
>   * printk rate limiting, lifted from the networking subsystem.
>   *
> 
> --


-- 
~Randy
--
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