linux-kernel - [PATCH 06/12] parisc: Replace cpu_up/down with device

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Message-Id: <20191030153837.18107-7-qais.yousef@arm.com>
Date:   Wed, 30 Oct 2019 15:38:31 +0000
From:   Qais Yousef <qais.yousef@....com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Qais Yousef <qais.yousef@....com>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        Richard Fontana <rfontana@...hat.com>,
        Armijn Hemel <armijn@...ldur.nl>, linux-parisc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 06/12] parisc: Replace cpu_up/down with device_online/offline

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@....com>
CC: "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
CC: Helge Deller <deller@....de>
CC: Richard Fontana <rfontana@...hat.com>
CC: Armijn Hemel <armijn@...ldur.nl>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: linux-parisc@...r.kernel.org
CC: linux-kernel@...r.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