linux-kernel - [PATCH] ARM: don't print missing L2 cache as error

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Date:	Wed, 27 Jan 2016 17:27:19 -0800
From:	Stefan Agner <stefan@...er.ch>
To:	linux@....linux.org.uk
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Stefan Agner <stefan@...er.ch>
Subject: [PATCH] ARM: don't print missing L2 cache as error

Not having a L2 cache controller is a shame, but not an error. Avoid
printing an error message if L2 controller initialization returns
with ENODEV.

Signed-off-by: Stefan Agner <stefan@...er.ch>
---
Hi Russel,

We use a multiplatform kernel for two similar SoC's, one with L2
cache the other without. Maybe silently ignore -ENODEV would be
an option too, not sure what is preferred here.

--
Stefan

 arch/arm/kernel/irq.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 1d45320e..f80c480 100644
--- 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("L2C: no device found\n");
+		else if (ret)
 			pr_err("L2C: failed to init: %d\n", ret);
 	}
 
-- 
2.7.0