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rtc/lib: Provide y2038 safe rtc_tm_to_time()/rtc_time_to_tm() replacement 

As part of addressing "y2038 problem" for in-kernel uses, this patch
adds safe rtc_tm_to_time64()/rtc_time64_to_tm() respectively using
time64_t.

After this patch, rtc_tm_to_time() is deprecated and all its call
sites will be fixed using corresponding safe versions, it can be
removed when having no users. Also change rtc_tm_to_time64() to
return time64_t directly instead of just as a parameter like
rtc_tm_to_time() does.

After this patch, rtc_time_to_tm() is deprecated and all its call
sites will be fixed using corresponding safe versions, it can be
removed when having no users.

In addition, change rtc_tm_to_ktime() and rtc_ktime_to_tm() to use
the safe version in passing.

Signed-off-by: pang.xunlei <pang.xunlei@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
pang.xunlei 2014-11-18 19:15:19 +08:00 committed by John Stultz
parent 5322e4c264
commit c2c11ae4b6
2 changed files with 39 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/rtc/rtc-lib.c
View File

@ -45,16 +45,20 @@ int rtc_year_days(unsigned int day, unsigned int month, unsigned int year)
}
EXPORT_SYMBOL(rtc_year_days);
/*
* rtc_time_to_tm64 - Converts time64_t to rtc_time.
* Convert seconds since 01-01-1970 00:00:00 to Gregorian date.
*/
void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
void rtc_time64_to_tm(time64_t time, struct rtc_time *tm)
{
unsigned int month, year;
unsigned long secs;
int days;
days = time / 86400;
time -= (unsigned int) days * 86400;
/* time must be positive */
days = div_s64(time, 86400);
secs = time - (unsigned int) days * 86400;
/* day of the week, 1970-01-01 was a Thursday */
tm->tm_wday = (days + 4) % 7;
@ -81,14 +85,14 @@ void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
tm->tm_mon = month;
tm->tm_mday = days + 1;
tm->tm_hour = time / 3600;
time -= tm->tm_hour * 3600;
tm->tm_min = time / 60;
tm->tm_sec = time - tm->tm_min * 60;
tm->tm_hour = secs / 3600;
secs -= tm->tm_hour * 3600;
tm->tm_min = secs / 60;
tm->tm_sec = secs - tm->tm_min * 60;
tm->tm_isdst = 0;
}
EXPORT_SYMBOL(rtc_time_to_tm);
EXPORT_SYMBOL(rtc_time64_to_tm);
/*
* Does the rtc_time represent a valid date/time?
@ -109,24 +113,22 @@ int rtc_valid_tm(struct rtc_time *tm)
EXPORT_SYMBOL(rtc_valid_tm);
/*
* rtc_tm_to_time64 - Converts rtc_time to time64_t.
* Convert Gregorian date to seconds since 01-01-1970 00:00:00.
*/
int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time)
time64_t rtc_tm_to_time64(struct rtc_time *tm)
{
*time = mktime(tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
return mktime64(tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
return 0;
}
EXPORT_SYMBOL(rtc_tm_to_time);
EXPORT_SYMBOL(rtc_tm_to_time64);
/*
* Convert rtc_time to ktime
*/
ktime_t rtc_tm_to_ktime(struct rtc_time tm)
{
time_t time;
rtc_tm_to_time(&tm, &time);
return ktime_set(time, 0);
return ktime_set(rtc_tm_to_time64(&tm), 0);
}
EXPORT_SYMBOL_GPL(rtc_tm_to_ktime);
@ -135,14 +137,14 @@ EXPORT_SYMBOL_GPL(rtc_tm_to_ktime);
*/
struct rtc_time rtc_ktime_to_tm(ktime_t kt)
{
struct timespec ts;
struct timespec64 ts;
struct rtc_time ret;
ts = ktime_to_timespec(kt);
ts = ktime_to_timespec64(kt);
/* Round up any ns */
if (ts.tv_nsec)
ts.tv_sec++;
rtc_time_to_tm(ts.tv_sec, &ret);
rtc_time64_to_tm(ts.tv_sec, &ret);
return ret;
}
EXPORT_SYMBOL_GPL(rtc_ktime_to_tm);

21
include/linux/rtc.h
View File

@ -19,11 +19,28 @@
extern int rtc_month_days(unsigned int month, unsigned int year);
extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year);
extern int rtc_valid_tm(struct rtc_time *tm);
extern int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time);
extern void rtc_time_to_tm(unsigned long time, struct rtc_time *tm);
extern time64_t rtc_tm_to_time64(struct rtc_time *tm);
extern void rtc_time64_to_tm(time64_t time, struct rtc_time *tm);
ktime_t rtc_tm_to_ktime(struct rtc_time tm);
struct rtc_time rtc_ktime_to_tm(ktime_t kt);
/**
* Deprecated. Use rtc_time64_to_tm().
*/
static inline void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
{
rtc_time64_to_tm(time, tm);
}
/**
* Deprecated. Use rtc_tm_to_time64().
*/
static inline int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time)
{
*time = rtc_tm_to_time64(tm);
return 0;
}
#include <linux/device.h>
#include <linux/seq_file.h>