linux-kernel - [PATCH] rtc: sunplus: fix format string for printing resource

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Message-Id: <20230117172450.2938962-1-arnd@kernel.org>
Date:   Tue, 17 Jan 2023 18:24:44 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Vincent Shih <vincent.sunplus@...il.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-rtc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] rtc: sunplus: fix format string for printing resource

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

On 32-bit architectures with 64-bit resource_size_t, sp_rtc_probe()
causes a compiler warning:

drivers/rtc/rtc-sunplus.c: In function 'sp_rtc_probe':
drivers/rtc/rtc-sunplus.c:243:33: error: format '%x' expects argument of type 'unsigned int', but argument 4 has type 'resource_size_t' {aka 'long long unsigned int'} [-Werror=format=]
  243 |         dev_dbg(&plat_dev->dev, "res = 0x%x, reg_base = 0x%lx\n",
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The best way to print a resource is the special %pR format string,
and similarly to print a pointer we can use %p and avoid the cast.

Fixes: fad6cbe9b2b4 ("rtc: Add driver for RTC in Sunplus SP7021")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/rtc/rtc-sunplus.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-sunplus.c b/drivers/rtc/rtc-sunplus.c
index e8e2ab1103fc..4b578e4d44f6 100644
--- a/drivers/rtc/rtc-sunplus.c
+++ b/drivers/rtc/rtc-sunplus.c
@@ -240,8 +240,8 @@ static int sp_rtc_probe(struct platform_device *plat_dev)
 	if (IS_ERR(sp_rtc->reg_base))
 		return dev_err_probe(&plat_dev->dev, PTR_ERR(sp_rtc->reg_base),
 					    "%s devm_ioremap_resource fail\n", RTC_REG_NAME);
-	dev_dbg(&plat_dev->dev, "res = 0x%x, reg_base = 0x%lx\n",
-		sp_rtc->res->start, (unsigned long)sp_rtc->reg_base);
+	dev_dbg(&plat_dev->dev, "res = %pR, reg_base = %p\n",
+		sp_rtc->res, sp_rtc->reg_base);
 
 	sp_rtc->irq = platform_get_irq(plat_dev, 0);
 	if (sp_rtc->irq < 0)
-- 
2.39.0