linux-kernel - [PATCH] genirq: Fix export of irq_to

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Date:   Fri, 25 Dec 2020 22:30:58 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     torvalds@...ux-foundation.org
Cc:     tglx@...utronix.de, linux-kernel@...r.kernel.org,
        linuxppc-dev@...abs.org
Subject: [PATCH] genirq: Fix export of irq_to_desc() for powerpc KVM

Commit 64a1b95bb9fe ("genirq: Restrict export of irq_to_desc()")
removed the export of irq_to_desc() unless powerpc KVM is being built,
because there is still a use of irq_to_desc() in modular code there.

However it used:

  #ifdef CONFIG_KVM_BOOK3S_64_HV

Which doesn't work when that symbol is =m, leading to a build failure:

  ERROR: modpost: "irq_to_desc" [arch/powerpc/kvm/kvm-hv.ko] undefined!

Fix it by checking for the definedness of the correct symbol which is
CONFIG_KVM_BOOK3S_64_HV_MODULE.

Fixes: 64a1b95bb9fe ("genirq: Restrict export of irq_to_desc()")
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
---
 kernel/irq/irqdesc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 3d0bc38a0bcf..cc1a09406c6e 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -352,7 +352,7 @@ struct irq_desc *irq_to_desc(unsigned int irq)
 {
 	return radix_tree_lookup(&irq_desc_tree, irq);
 }
-#ifdef CONFIG_KVM_BOOK3S_64_HV
+#ifdef CONFIG_KVM_BOOK3S_64_HV_MODULE
 EXPORT_SYMBOL_GPL(irq_to_desc);
 #endif

-- 
2.25.1