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

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Date:   Wed, 25 Apr 2018 23:36:06 +0000
From:   Rohit Khanna <rokhanna@...dia.com>
To:     "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Thierry Reding" <treding@...dia.com>,
        Alexander Van Brunt <avanbrunt@...dia.com>,
        "Bo Yan" <byan@...dia.com>, Jason Sequeira <jsequeira@...dia.com>
Subject: Re: [PATCH] arm64: skip cpu nodes marked as disabled in DT

Adding few other folks.

Thanks
Rohit
________________________________________
From: Rohit Khanna
Sent: Wednesday, April 25, 2018 4:08 PM
To: catalin.marinas@....com; will.deacon@....com
Cc: linux-kernel@...r.kernel.org; Rohit Khanna
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