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From:   Qais Yousef <qais.yousef@arm.com>
To:     Thomas Gleixner <tglx@linutronix.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Qais Yousef <qais.yousef@arm.com>,
        "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
        Helge Deller <deller@gmx.de>,
        Richard Fontana <rfontana@redhat.com>,
        Armijn Hemel <armijn@tjaldur.nl>, linux-parisc@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH 06/12] parisc: Replace cpu_up/down with device_online/offline
Date:   Wed, 30 Oct 2019 15:38:31 +0000
Message-Id: <20191030153837.18107-7-qais.yousef@arm.com>
In-Reply-To: <20191030153837.18107-1-qais.yousef@arm.com>
References: <20191030153837.18107-1-qais.yousef@arm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

The core device API performs extra housekeeping bits that are missing
from directly calling cpu_up/down.

See commit a6717c01ddc2 ("powerpc/rtas: use device model APIs and
serialization during LPM") for an example description of what might go
wrong.

This also prepares to make cpu_up/down a private interface for anything
but the cpu subsystem.

Signed-off-by: Qais Yousef <qais.yousef@arm.com>
CC: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
CC: Helge Deller <deller@gmx.de>
CC: Richard Fontana <rfontana@redhat.com>
CC: Armijn Hemel <armijn@tjaldur.nl>
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: linux-parisc@vger.kernel.org
CC: linux-kernel@vger.kernel.org
---

Couldn't compile test this one.

I'm not confident that this is a correct patch to be honest. This __init
indicates we're booting the secondary cpus and that might be too early in the
process to use the core API..?


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

diff --git a/arch/parisc/kernel/processor.c b/arch/parisc/kernel/processor.c
index 13f771f74ee3..4dde5fe78f0c 100644
--- a/arch/parisc/kernel/processor.c
+++ b/arch/parisc/kernel/processor.c
@@ -212,7 +212,9 @@ static int __init processor_probe(struct parisc_device *dev)
 #ifdef CONFIG_SMP
 	if (cpuid) {
 		set_cpu_present(cpuid, true);
-		cpu_up(cpuid);
+		lock_device_hotplug();
+		device_online(get_cpu_device(cpuid));
+		unlock_device_hotplug();
 	}
 #endif
 
-- 
2.17.1