[xen staging-4.21] ppc/irq: introduce a dummy irq_to_desc()

[patchbot@xxxxxxx]

commit 7aa8647037d1395e9125a8f974e2908f61a90876
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Tue Jun 30 14:56:59 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jun 30 14:56:59 2026 +0200

    ppc/irq: introduce a dummy irq_to_desc()
    
    In preparation for irq_to_desc() being called by common IRQ code.
    PowerPC doesn't have an irq_desc array defined, so it cannot use the
    generic irq_to_desc macro in the common header.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    master commit: ed39935f50b9b4cd4db27652804d260bd0081e67
    master date: 2026-06-29 17:14:47 +0200
---
 xen/arch/ppc/include/asm/irq.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/xen/arch/ppc/include/asm/irq.h b/xen/arch/ppc/include/asm/irq.h
index 5c37d0cf25..fa70fd7d46 100644
--- a/xen/arch/ppc/include/asm/irq.h
+++ b/xen/arch/ppc/include/asm/irq.h
@@ -30,4 +30,10 @@ static inline int platform_get_irq(const struct 
dt_device_node *device, int inde
     BUG_ON("unimplemented");
 }
 
+static inline void *irq_to_desc(unsigned int irq)
+{
+    BUG_ON("unimplemented");
+}
+#define irq_to_desc irq_to_desc
+
 #endif /* __ASM_PPC_IRQ_H__ */
--
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