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time: add get_timespec64 and put_timespec64

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Add helper functions to convert between struct timespec64 and
struct timespec at userspace boundaries.

This is a preparatory patch to use timespec64 as the basic type
internally in the kernel as timespec is not y2038 safe on 32 bit systems.
The patch helps the cause by containing all data conversions at the
userspace boundaries within these functions.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Deepa Dinamani 2017-06-24 11:45:02 -07:00 • committed by Al Viro
parent 938e7cf2d5
commit f59dd9c886
4 changed files with 79 additions and 0 deletions
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5
include/linux/time.h
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@ -8,6 +8,11 @@
extern struct timezone sys_tz;
int get_timespec64(struct timespec64 *ts,
const struct timespec __user *uts);
int put_timespec64(const struct timespec64 *ts,
struct timespec __user *uts);
#define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
static inline int timespec_equal(const struct timespec *a,