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time: Add y2038 safe read_boot_clock64()

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As part of addressing in-kernel y2038 issues, this patch adds
read_boot_clock64() and replaces all the call sites of
read_boot_clock() with this function. This is a __weak
implementation, which simply calls the existing y2038 unsafe
read_boot_clock().

This allows architecture specific implementations to be
converted independently, and eventually the y2038 unsafe
read_boot_clock() can be removed after all its architecture
specific implementations have been converted to
read_boot_clock64().

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1427945681-29972-2-git-send-email-john.stultz@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Xunlei Pang 2015-04-01 20:34:21 -07:00 committed by Ingo Molnar
parent 3650b57fdf
commit 9a806ddbb9
2 changed files with 10 additions and 2 deletions
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1
include/linux/timekeeping.h
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@ -269,6 +269,7 @@ static inline bool has_persistent_clock(void)
extern void read_persistent_clock(struct timespec *ts);
extern void read_boot_clock(struct timespec *ts);
extern void read_boot_clock64(struct timespec64 *ts);
extern int update_persistent_clock(struct timespec now);

11
kernel/time/timekeeping.c
View File

@ -1188,6 +1188,14 @@ void __weak read_boot_clock(struct timespec *ts)
ts->tv_nsec = 0;
}
void __weak read_boot_clock64(struct timespec64 *ts64)
{
struct timespec ts;
read_boot_clock(&ts);
*ts64 = timespec_to_timespec64(ts);
}
/*
* timekeeping_init - Initializes the clocksource and common timekeeping values
*/
@ -1209,8 +1217,7 @@ void __init timekeeping_init(void)
} else if (now.tv_sec || now.tv_nsec)
persistent_clock_exist = true;
read_boot_clock(&ts);
boot = timespec_to_timespec64(ts);
read_boot_clock64(&boot);
if (!timespec64_valid_strict(&boot)) {
pr_warn("WARNING: Boot clock returned invalid value!\n"
" Check your CMOS/BIOS settings.\n");