Patch "x86: i8259: export legacy_pic symbol" has been added to the 4.4-stable tree

Patch "x86: i8259: export legacy_pic symbol" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    x86: i8259: export legacy_pic symbol

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     x86-i8259-export-legacy_pic-symbol.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Mar 22 14:57:32 CET 2018
From: Hans de Goede <hdegoede@redhat.com>
Date: Sat, 8 Apr 2017 19:54:20 +0200
Subject: x86: i8259: export legacy_pic symbol

From: Hans de Goede <hdegoede@redhat.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@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>
---
 arch/x86/kernel/i8259.c |    1 +
 1 file changed, 1 insertion(+)

--- 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)
 {


Patches currently in stable-queue which might be from hdegoede@redhat.com are

queue-4.4/acpi-pmic-xpower-fix-power_table-addresses.patch
queue-4.4/rtc-cmos-do-not-assume-irq-8-for-rtc-when-there-are-no-legacy-irqs.patch
queue-4.4/genirq-use-irqd_get_trigger_type-to-compare-the-trigger-type-for-shared-irqs.patch
queue-4.4/x86-i8259-export-legacy_pic-symbol.patch