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Subject[PATCH AUTOSEL for 4.9 029/190] x86: i8259: export legacy_pic symbol
From: Hans de Goede <>

[ 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.

Signed-off-by: Hans de Goede <>
Signed-off-by: Alexandre Belloni <>
Signed-off-by: Sasha Levin <>
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;

static int __init i8259A_init_ops(void)
 \ /
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