linux-kernel - [PATCH v3 7/7] ARM: sun8i: smp: Remove the disabling of CPU0

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Message-Id: <20180219081837.15482-8-mylene.josserand@bootlin.com>
Date:   Mon, 19 Feb 2018 09:18:37 +0100
From:   Mylène Josserand <mylene.josserand@...tlin.com>
To:     maxime.ripard@...tlin.com, wens@...e.org, linux@...linux.org.uk,
        robh+dt@...nel.org, mark.rutland@....com
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, clabbe.montjoie@...il.com,
        thomas.petazzoni@...tlin.com, mylene.josserand@...tlin.com,
        quentin.schulz@...tlin.com
Subject: [PATCH v3 7/7] ARM: sun8i: smp: Remove the disabling of CPU0

On sun8i-a63t, hotplug CPU for CPU0 is currently not working.
Remove the possibility to disable CPU0 only for sun8i-a83t.

Signed-off-by: Mylène Josserand <mylene.josserand@...tlin.com>
---
 arch/arm/mach-sunxi/mc_smp.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-sunxi/mc_smp.c b/arch/arm/mach-sunxi/mc_smp.c
index fec592bf68b4..69d5ae5b3d72 100644
--- a/arch/arm/mach-sunxi/mc_smp.c
+++ b/arch/arm/mach-sunxi/mc_smp.c
@@ -661,8 +661,12 @@ static int sunxi_mc_smp_cpu_kill(unsigned int l_cpu)
 	return !ret;
 }
 
-static bool sunxi_mc_smp_cpu_can_disable(unsigned int __unused)
+static bool sunxi_mc_smp_cpu_can_disable(unsigned int cpu)
 {
+	/* CPU0 hotplug handled only for sun9i */
+	if (of_machine_is_compatible("allwinner,sun8i-a83t"))
+		if (cpu == 0)
+			return false;
 	return true;
 }
 #endif
-- 
2.11.0