[irqchip: irq/irqchip-next] irqchip/loongson-htpic: Fix build warnings

[irqchip-bot for Huacai Chen]

The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID:     3ee36352e26935c7e8145eb4e7ed38b536ca01fc
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/3ee36352e26935c7e8145eb4e7ed38b536ca01fc
Author:        Huacai Chen <chenhuacai@xxxxxxxxxx>
AuthorDate:    Sat, 05 Dec 2020 17:15:44 +08:00
Committer:     Marc Zyngier <maz@xxxxxxxxxx>
CommitterDate: Fri, 11 Dec 2020 14:40:17 

irqchip/loongson-htpic: Fix build warnings

Fix build warnings as below:

   drivers/irqchip/irq-loongson-htpic.c: In function 'htpic_reg_init':
>> drivers/irqchip/irq-loongson-htpic.c:62:12: warning: variable 'val' set but not used [-Wunused-but-set-variable]
      62 |   uint32_t val;
         |            ^~~
   drivers/irqchip/irq-loongson-htpic.c: At top level:
>> drivers/irqchip/irq-loongson-htpic.c:84:12: warning: no previous prototype for 'htpic_of_init' [-Wmissing-prototypes]
      84 | int __init htpic_of_init(struct device_node *node, struct device_node *parent)
         |            ^~~~~~~~~~~~~

Fixes: a93f1d903fa34fc2c5d9fa450bd ("irqchip: Add driver for Loongson-3 HyperTransport PIC controller")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/1607159744-995-1-git-send-email-chenhuacai@xxxxxxxxxx
---
 drivers/irqchip/irq-loongson-htpic.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-loongson-htpic.c b/drivers/irqchip/irq-loongson-htpic.c
index 63f7280..1b801c4 100644
--- a/drivers/irqchip/irq-loongson-htpic.c
+++ b/drivers/irqchip/irq-loongson-htpic.c
@@ -59,11 +59,10 @@ static void htpic_reg_init(void)
 	int i;
 
 	for (i = 0; i < HTINT_NUM_VECTORS; i++) {
-		uint32_t val;
-
 		/* Disable all HT Vectors */
 		writel(0x0, htpic->base + HTINT_EN_OFF + i * 0x4);
-		val = readl(htpic->base + i * 0x4);
+		/* Read back to force write */
+		(void) readl(htpic->base + i * 0x4);
 		/* Ack all possible pending IRQs */
 		writel(GENMASK(31, 0), htpic->base + i * 0x4);
 	}
@@ -81,7 +80,7 @@ struct syscore_ops htpic_syscore_ops = {
 	.resume		= htpic_resume,
 };
 
-int __init htpic_of_init(struct device_node *node, struct device_node *parent)
+static int __init htpic_of_init(struct device_node *node, struct device_node *parent)
 {
 	unsigned int parent_irq[4];
 	int i, err;