linux-kernel - [PATCH 2/2] x86/irq/i8259: Configure null pic to have one legacy IRQ

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Message-ID: <20231020033806.88063-2-mario.limonciello@amd.com>
Date:   Thu, 19 Oct 2023 22:38:06 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <dave.hansen@...ux.intel.com>
CC:     <x86@...nel.org>, <hpa@...or.com>, <linux-kernel@...r.kernel.org>,
        <dlazar@...il.com>, <hdegoede@...hat.com>,
        Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH 2/2] x86/irq/i8259: Configure null pic to have one legacy IRQ

If the system is configured with the NULL PIC, the system should
still be able to set up the timer IRQ at IRQ 0.

Link: https://lore.kernel.org/linux-kernel/878r7z4kb4.ffs@tglx/
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 arch/x86/kernel/i8259.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/i8259.c b/arch/x86/kernel/i8259.c
index 43c1c24e934b..885687e64e4e 100644
--- a/arch/x86/kernel/i8259.c
+++ b/arch/x86/kernel/i8259.c
@@ -424,7 +424,7 @@ static int legacy_pic_probe(void)
 }
 
 struct legacy_pic null_legacy_pic = {
-	.nr_legacy_irqs = 0,
+	.nr_legacy_irqs = 1,
 	.chip = &dummy_irq_chip,
 	.mask = legacy_pic_uint_noop,
 	.unmask = legacy_pic_uint_noop,
-- 
2.34.1