linux-kernel - [PATCH] irqchip: armada: suppress unused-function warning

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Date:   Thu, 15 Dec 2022 18:01:57 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Nathan Rossi <nathan.rossi@...i.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Pali Rohár <pali@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] irqchip: armada: suppress unused-function warning

From: Arnd Bergmann <arnd@...db.de>

armada_370_xp_msi_reenable_percpu is only defined when CONFIG_PCI_MSI
is enabled, and only called when SMP is enabled.

Without CONFIG_SMP, there are no callers, so we get a build time
warning instead:

drivers/irqchip/irq-armada-370-xp.c:319:13: error: 'armada_370_xp_msi_reenable_percpu' defined but not used [-Werror=unused-function]
  319 | static void armada_370_xp_msi_reenable_percpu(void) {}
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Mark the function as __maybe_unused to avoid adding more complexity
to the #ifdefs.

Fixes: 8ca61cde32c1 ("irqchip/armada-370-xp: Enable MSI affinity configuration")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/irqchip/irq-armada-370-xp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c
index ee18eb3e72b7..178ff63f8e93 100644
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -316,7 +316,7 @@ static int armada_370_xp_msi_init(struct device_node *node,
 	return 0;
 }
 #else
-static void armada_370_xp_msi_reenable_percpu(void) {}
+static __maybe_unused void armada_370_xp_msi_reenable_percpu(void) {}
 
 static inline int armada_370_xp_msi_init(struct device_node *node,
 					 phys_addr_t main_int_phys_base)
-- 
2.35.1