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x86: i8259: export legacy_pic symbol

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[ 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@googlegroups.com
Cc: alexandre.belloni@free-electrons.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans de Goede 2017-04-08 19:54:20 +02:00 committed by Greg Kroah-Hartman
parent 5eb153f601
commit 1c48107741
1 changed files with 1 additions and 0 deletions
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arch/x86/kernel/i8259.c
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@ -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)
{