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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Mark Salter <msalter@redhat.com>
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Date: Fri, 11 May 2018 21:01:17 -0400
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Subject: [PATCH] acpi: prefer booting with ACPI over DTS
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Message-id: <20180511210117.10457-1-msalter@redhat.com>
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Patchwork-id: 214708
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O-Subject: [RHEL-8 BZ1576869] [RHEL only] acpi: prefer booting with ACPI over DTS
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Bugzilla: 1576869
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RH-Acked-by: Jonathan Toppins <jtoppins@redhat.com>
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RH-Acked-by: Tony Camuso <tcamuso@redhat.com>
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RH-Acked-by: Bhupesh Sharma <bhsharma@redhat.com>
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RH-Acked-by: Dean Nelson <dnelson@redhat.com>
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1576869
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Brew: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=16208479
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Testing: Verified kernel defaults to ACPI on Mustang
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From: Jonathan Toppins <jtoppins@redhat.com>
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This patch forces ACPI boot tables to be preferred over DTS.
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Currently for ACPI to be used a user either has to set acpi=on on the
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kernel command line or make sure any device tree passed to the kernel
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is empty. If the dtb passed to the kernel is non-empty then device-tree
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will be chosen as the boot method of choice.
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RHEL does not wish to support this boot method so change table boot
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preferences to use ACPI. In the event ACPI table checks fail the kernel
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will fallback to using DTS to boot.
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Signed-off-by: Jonathan Toppins <jtoppins@redhat.com>
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Upstream Status: RHEL only
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Signed-off-by: Mark Salter <msalter@redhat.com>
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Signed-off-by: Herton R. Krzesinski <herton@redhat.com>
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---
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arch/arm64/kernel/acpi.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
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index a100483b47c4..29f693734edb 100644
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--- a/arch/arm64/kernel/acpi.c
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+++ b/arch/arm64/kernel/acpi.c
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@@ -39,7 +39,7 @@ int acpi_pci_disabled = 1; /* skip ACPI PCI scan and IRQ initialization */
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EXPORT_SYMBOL(acpi_pci_disabled);
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static bool param_acpi_off __initdata;
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-static bool param_acpi_on __initdata;
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+static bool param_acpi_on __initdata = true;
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static bool param_acpi_force __initdata;
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static int __init parse_acpi(char *arg)
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--
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2.26.2
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