linux-kernel - [PATCH] clocksource: fsl: avoid harmless 64-bit warnings

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Date:	Mon, 16 Nov 2015 17:34:50 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Xiubo Li <Li.Xiubo@...escale.com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Stefan Agner <stefan@...er.ch>
Subject: [PATCH] clocksource: fsl: avoid harmless 64-bit warnings

The ftm_clockevent_init passes the value of "~0UL" into a function
that takes a 32-bit argument, which drops the upper 32 bits, as
gcc warns about on ARM64:

clocksource/fsl_ftm_timer.c: In function 'ftm_clockevent_init':
clocksource/fsl_ftm_timer.c:206:13: warning: large integer implicitly truncated to unsigned type [-Woverflow]

This was obviously unintended behavior, and is easily avoided by
using '~0u' as the integer literal, because that is 32-bit wide
on all architectures.

Signed-off-by: Arnd Bergmann <arnd@...db.de>

diff --git a/drivers/clocksource/fsl_ftm_timer.c b/drivers/clocksource/fsl_ftm_timer.c
index 10202f1fdfd7..517e1c7624d4 100644
--- a/drivers/clocksource/fsl_ftm_timer.c
+++ b/drivers/clocksource/fsl_ftm_timer.c
@@ -203,7 +203,7 @@ static int __init ftm_clockevent_init(unsigned long freq, int irq)
 	int err;
 
 	ftm_writel(0x00, priv->clkevt_base + FTM_CNTIN);
-	ftm_writel(~0UL, priv->clkevt_base + FTM_MOD);
+	ftm_writel(~0u, priv->clkevt_base + FTM_MOD);
 
 	ftm_reset_counter(priv->clkevt_base);
 
@@ -230,7 +230,7 @@ static int __init ftm_clocksource_init(unsigned long freq)
 	int err;
 
 	ftm_writel(0x00, priv->clksrc_base + FTM_CNTIN);
-	ftm_writel(~0UL, priv->clksrc_base + FTM_MOD);
+	ftm_writel(~0u, priv->clksrc_base + FTM_MOD);
 
 	ftm_reset_counter(priv->clksrc_base);
 

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