linux-kernel - [PATCH] arm64: skip cpu nodes marked as disabled in DT

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Message-ID: <1524697712-20208-1-git-send-email-rokhanna@nvidia.com>
Date:   Wed, 25 Apr 2018 16:08:32 -0700
From:   Rohit Khanna <rokhanna@...dia.com>
To:     <catalin.marinas@....com>, <will.deacon@....com>
CC:     <linux-kernel@...r.kernel.org>, Rohit Khanna <rokhanna@...dia.com>
Subject: [PATCH] arm64: skip cpu nodes marked as disabled in DT

Skip the CPU nodes that are marked as disabled in DT.

Bug 1828570

Signed-off-by: Rohit Khanna <rokhanna@...dia.com>
Reviewed-on: http://git-master/r/1245333
Reviewed-by: Alexander Van Brunt <avanbrunt@...dia.com>
---
 arch/arm64/kernel/smp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index f3e2e3aec0b0..2b4371b0948d 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -578,6 +578,10 @@ static void __init of_parse_and_init_cpus(void)
 	for_each_node_by_type(dn, "cpu") {
 		u64 hwid = of_get_cpu_mpidr(dn);
 
+		/* Check to see if the cpu is disabled */
+		if (!of_device_is_available(dn))
+			goto next;
+
 		if (hwid == INVALID_HWID)
 			goto next;
 
-- 
2.1.4