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Message-Id: <20180420161433.3721192-1-arnd@arndb.de>
Date: Fri, 20 Apr 2018 18:14:24 +0200
From: Arnd Bergmann <arnd@...db.de>
To: Alessandro Zummo <a.zummo@...ertech.it>,
Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: y2038@...ts.linaro.org, Arnd Bergmann <arnd@...db.de>,
linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] rtc: vr41xx: remove mktime usage
This driver uses mktime() and rtc_time_to_tm() to convert between time
values. This works fine on 64-bit kernels over the whole supported
range, and the vr41xx chip is a 64-bit MIPS implementation, but it is
inconsistent because it doesn't do the same thing on 32-bit kernels that
overflow in 2106 or 2038.
Changing it to use mktime64/rtc_time64_to_tm() should have no visible
impact on vr41xx but gets us closer to removing the 32-bit interfaces.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
drivers/rtc/rtc-vr41xx.c | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)
diff --git a/drivers/rtc/rtc-vr41xx.c b/drivers/rtc/rtc-vr41xx.c
index 7ce22967fd16..480cffe8d321 100644
--- a/drivers/rtc/rtc-vr41xx.c
+++ b/drivers/rtc/rtc-vr41xx.c
@@ -88,7 +88,7 @@ static unsigned int alarm_enabled;
static int aie_irq;
static int pie_irq;
-static inline unsigned long read_elapsed_second(void)
+static inline time64_t read_elapsed_second(void)
{
unsigned long first_low, first_mid, first_high;
@@ -105,10 +105,10 @@ static inline unsigned long read_elapsed_second(void)
} while (first_low != second_low || first_mid != second_mid ||
first_high != second_high);
- return (first_high << 17) | (first_mid << 1) | (first_low >> 15);
+ return ((u64)first_high << 17) | (first_mid << 1) | (first_low >> 15);
}
-static inline void write_elapsed_second(unsigned long sec)
+static inline void write_elapsed_second(time64_t sec)
{
spin_lock_irq(&rtc_lock);
@@ -121,22 +121,22 @@ static inline void write_elapsed_second(unsigned long sec)
static int vr41xx_rtc_read_time(struct device *dev, struct rtc_time *time)
{
- unsigned long epoch_sec, elapsed_sec;
+ time64_t epoch_sec, elapsed_sec;
- epoch_sec = mktime(epoch, 1, 1, 0, 0, 0);
+ epoch_sec = mktime64(epoch, 1, 1, 0, 0, 0);
elapsed_sec = read_elapsed_second();
- rtc_time_to_tm(epoch_sec + elapsed_sec, time);
+ rtc_time64_to_tm(epoch_sec + elapsed_sec, time);
return 0;
}
static int vr41xx_rtc_set_time(struct device *dev, struct rtc_time *time)
{
- unsigned long epoch_sec, current_sec;
+ time64_t epoch_sec, current_sec;
- epoch_sec = mktime(epoch, 1, 1, 0, 0, 0);
- current_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
+ epoch_sec = mktime64(epoch, 1, 1, 0, 0, 0);
+ current_sec = mktime64(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
time->tm_hour, time->tm_min, time->tm_sec);
write_elapsed_second(current_sec - epoch_sec);
@@ -165,11 +165,11 @@ static int vr41xx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
static int vr41xx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
{
- unsigned long alarm_sec;
+ time64_t alarm_sec;
struct rtc_time *time = &wkalrm->time;
- alarm_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
- time->tm_hour, time->tm_min, time->tm_sec);
+ alarm_sec = mktime64(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
+ time->tm_hour, time->tm_min, time->tm_sec);
spin_lock_irq(&rtc_lock);
--
2.9.0
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