Re: [patch 08/17] LTTng instrumentation - kernel

[Steven Rostedt]

On Tue, 15 Jul 2008, Mathieu Desnoyers wrote:
>
>  /*
>   * Low level drivers may need that to know if they can schedule in
> @@ -601,6 +603,7 @@ asmlinkage int printk(const char *fmt, .
>  	int r;
>
>  	va_start(args, fmt);
> +	trace_kernel_printk(__builtin_return_address(0));

BTW, ftrace.h has macros that let you use CALLER_ADDR0 for
__builtin_return_address. It also converts it from a pointer to a long,
but makes the code look prettier.


>  	r = vprintk(fmt, args);
>  	va_end(args);
>
> @@ -677,6 +680,9 @@ asmlinkage int vprintk(const char *fmt,
>  	raw_local_irq_save(flags);
>  	this_cpu = smp_processor_id();
>
> +	trace_kernel_vprintk(__builtin_return_address(0),
> +		printk_buf, printed_len);
> +
>  	/*
>  	 * Ouch, printk recursed into itself!
>  	 */

-- Steve

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/