timekeeping: Provide y2038 safe accessor to the seconds portion of CLOCK_REALTIME
ktime_get_real_seconds() is the replacement function for get_seconds() returning the seconds portion of CLOCK_REALTIME in a time64_t. For 64bit the function is equivivalent to get_seconds(), but for 32bit it protects the readout with the timekeeper sequence count. This is required because 32-bit machines cannot access 64-bit tk->xtime_sec variable atomically. [tglx: Massaged changelog and added docbook comment ] Signed-off-by: Heena Sirwani <heenasirwani@gmail.com> Reviewed-by: Arnd Bergman <arnd@arndb.de> Cc: John Stultz <john.stultz@linaro.org> Cc: opw-kernel@googlegroups.com Link: http://lkml.kernel.org/r/7adcfaa8962b8ad58785d9a2456c3f77d93c0ffb.1414578445.git.heenasirwani@gmail.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Thomas Gleixner

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@@ -29,6 +29,7 @@ struct timespec get_monotonic_coarse(void);
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extern void getrawmonotonic(struct timespec *ts);
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extern void ktime_get_ts64(struct timespec64 *ts);
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extern time64_t ktime_get_seconds(void);
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extern time64_t ktime_get_real_seconds(void);
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extern int __getnstimeofday64(struct timespec64 *tv);
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extern void getnstimeofday64(struct timespec64 *tv);
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