linux-kernel - Re: real time hang w/ latency tracing

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Date:	Wed, 4 Apr 2007 10:51:33 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: real time hang w/ latency tracing


* Daniel Walker <dwalker@...sta.com> wrote:

> Index: linux-2.6.20/include/linux/serial_core.h
> ===================================================================
> --- linux-2.6.20.orig/include/linux/serial_core.h
> +++ linux-2.6.20/include/linux/serial_core.h
> @@ -213,7 +213,11 @@ struct uart_icount {
>  typedef unsigned int __bitwise__ upf_t;
>  
>  struct uart_port {
> +#ifdef CONFIG_LATENCY_TIMING
> +	raw_spinlock_t		lock;			/* port lock */
> +#else
>  	spinlock_t		lock;			/* port lock */
> +#endif

ugh - this will only cause other problems if anyone else is trying to 
use the serial code. This needs a cleaner fix - such as not doing that 
printk from atomic context.

	Ingo
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