linux-kernel - [PATCH/RESEND] irqchip: gic: Don't complain in gic_get

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Message-Id: <1426141291-21641-1-git-send-email-sboyd@codeaurora.org>
Date:	Wed, 11 Mar 2015 23:21:31 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: [PATCH/RESEND] irqchip: gic: Don't complain in gic_get_cpumask() if UP system

In a uniprocessor implementation the interrupt processor targets
registers are read-as-zero/write-ignored (RAZ/WI). Unfortunately
gic_get_cpumask() will print a critical message saying

 GIC CPU mask not found - kernel will fail to boot.

if these registers all read as zero, but there won't actually be
a problem on uniprocessor systems and the kernel will boot just
fine. Skip this check if we're running a UP kernel or if we
detect that the hardware only supports a single processor.

Acked-by: Nicolas Pitre <nico@...aro.org>
Acked-by: Felipe Balbi <balbi@...com>
Acked-by: Nishanth Menon <nm@...com>
Acked-by: Stefan Agner <stefan@...er.ch>
Cc: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
---

Picked up acks from the list

 drivers/irqchip/irq-gic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 4634cf7d0ec3..50e70a8c7ec4 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -349,7 +349,7 @@ static u8 gic_get_cpumask(struct gic_chip_data *gic)
 			break;
 	}
 
-	if (!mask)
+	if (!mask && num_possible_cpus() > 1)
 		pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");
 
 	return mask;
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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