linux-kernel - [PATCH AUTOSEL for 4.4 013/101] x86: i8259: export legacy

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Date:   Thu, 8 Mar 2018 05:01:18 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Hans de Goede <hdegoede@...hat.com>,
        "rtc-linux@...glegroups.com" <rtc-linux@...glegroups.com>,
        "alexandre.belloni@...e-electrons.com" 
        <alexandre.belloni@...e-electrons.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.4 013/101] x86: i8259: export legacy_pic symbol

From: Hans de Goede <hdegoede@...hat.com>

[ Upstream commit 7ee06cb2f840a96be46233181ed4557901a74385 ]

The classic PC rtc-coms driver has a workaround for broken ACPI device
nodes for it which lack an irq resource. This workaround used to
unconditionally hardcode the irq to 8 in these cases.

This was causing irq conflict problems on systems without a legacy-pic
so a recent patch added an if (nr_legacy_irqs()) guard to the
workaround to avoid this irq conflict.

nr_legacy_irqs() uses the legacy_pic symbol under the hood causing
an undefined symbol error if the rtc-cmos code is build as a module.

This commit exports the legacy_pic symbol to fix this.

Cc: rtc-linux@...glegroups.com
Cc: alexandre.belloni@...e-electrons.com
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 arch/x86/kernel/i8259.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/i8259.c b/arch/x86/kernel/i8259.c
index be22f5a2192e..4e3b8a587c88 100644
--- a/arch/x86/kernel/i8259.c
+++ b/arch/x86/kernel/i8259.c
@@ -418,6 +418,7 @@ struct legacy_pic default_legacy_pic = {
 };
 
 struct legacy_pic *legacy_pic = &default_legacy_pic;
+EXPORT_SYMBOL(legacy_pic);
 
 static int __init i8259A_init_ops(void)
 {
-- 
2.14.1