Subject: [PATCH] arm: irq: l2c: do not print error in case of missing l2c from dtb

From: [email-masked] (Joe Perches)
Date: Mon, 11 Jan 2016 23:11:23 -0800

On Tue, 2016-01-12 at 15:34 +0900, Andi Shyti wrote:
> In some architectures the L2 cache controller is integrated in the
> processor's block itself and it doesn't use any external cache
> controller. This means that an entry in the board's dtb related
> to the l2c is not necessary.
> 
> Distinguish between error codes and print just an information in
> case of -ENODEV.

trivia:

> diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
[]
> @@ -95,7 +95,9 @@ void __init init_IRQ(void)
> ?			outer_cache.write_sec = machine_desc->l2c_write_sec;
> ?		ret = l2x0_of_init(machine_desc->l2c_aux_val,
> ?				???machine_desc->l2c_aux_mask);
> -		if (ret)
> +		if (ret == -ENODEV)
> +			pr_info("no L2C controller entry found in the dtb\n");

Perhaps this would be more consistent if it was
			pr_info("L2C: no controller entry found in the dtb\n");
> 
> +		else if (ret)
> ?			pr_err("L2C: failed to init: %d\n", ret);
> ?	}
> ?