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

x86: i8259: export legacy_pic symbol

to the 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: x86-i8259-export-legacy_pic-symbol.patch and it can be found in the queue-3.18 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 15:16:04 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 @@ -405,6 +405,7 @@ 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-3.18/genirq-use-irqd_get_trigger_type-to-compare-the-trigger-type-for-shared-irqs.patch queue-3.18/x86-i8259-export-legacy_pic-symbol.patch