Commit Graph

9 Commits

Author SHA1 Message Date
Arnd Bergmann e4b92b108c timekeeping: remove obsolete time accessors
There are no more remaining users of these deprecated wrappers, so
let's remove them before new users have a chance to make it in.

See Documentation/core-api/timekeeping.rst for replacements when
porting old drivers that contain calls to this function.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: John Stultz <john.stultz@linaro.org>
2018-12-18 16:13:05 +01:00
Arnd Bergmann 926617889d timekeeping: remove unused {read,update}_persistent_clock
After arch/sh has removed the last reference to these functions,
we can remove them completely and just rely on the 64-bit time_t
based versions. This cleans up a rather ugly use of __weak
functions.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: John Stultz <john.stultz@linaro.org>
2018-12-18 16:13:05 +01:00
Arnd Bergmann 33e2641819 y2038: make do_gettimeofday() and get_seconds() inline
get_seconds() and do_gettimeofday() are only used by a few modules now any
more (waiting for the respective patches to get accepted), and they are
among the last holdouts of code that is not y2038 safe in the core kernel.

Move the implementation into the timekeeping32.h header to clean up
the core kernel and isolate the old interfaces further.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2018-08-27 14:45:58 +02:00
Arnd Bergmann 976516404f y2038: remove unused time interfaces
After many small patches, at least some of the deprecated interfaces
have no remaining users any more and can be removed:

  current_kernel_time
  do_settimeofday
  get_monotonic_boottime
  get_monotonic_boottime64
  get_monotonic_coarse
  get_monotonic_coarse64
  getrawmonotonic64
  ktime_get_real_ts
  timekeeping_clocktai
  timespec_trunc
  timespec_valid_strict
  time_to_tm

For many of the remaining time functions, we are missing one or
two patches that failed to make it into 4.19, they will be removed
in the following merge window.

The replacement functions for the removed interfaces are documented in
Documentation/core-api/timekeeping.rst.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2018-08-27 12:59:56 +02:00
Arnd Bergmann fb7fcc96a8 timekeeping: Standardize on ktime_get_*() naming
The current_kernel_time64, get_monotonic_coarse64, getrawmonotonic64,
get_monotonic_boottime64 and timekeeping_clocktai64 interfaces have
rather inconsistent naming, and they differ in the calling conventions
by passing the output either by reference or as a return value.

Rename them to ktime_get_coarse_real_ts64, ktime_get_coarse_ts64,
ktime_get_raw_ts64, ktime_get_boottime_ts64 and ktime_get_clocktai_ts64
respectively, and provide the interfaces with macros or inline
functions as needed.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: y2038@lists.linaro.org
Cc: John Stultz <john.stultz@linaro.org>
Link: https://lkml.kernel.org/r/20180427134016.2525989-4-arnd@arndb.de
2018-05-19 13:57:32 +02:00
Arnd Bergmann edca71fecb timekeeping: Clean up ktime_get_real_ts64
In a move to make ktime_get_*() the preferred driver interface into the
timekeeping code, sanitizes ktime_get_real_ts64() to be a proper exported
symbol rather than an alias for getnstimeofday64().

The internal __getnstimeofday64() is no longer used, so remove that
and merge it into ktime_get_real_ts64().

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: y2038@lists.linaro.org
Cc: John Stultz <john.stultz@linaro.org>
Link: https://lkml.kernel.org/r/20180427134016.2525989-3-arnd@arndb.de
2018-05-19 13:57:32 +02:00
Arnd Bergmann 4f0fad9a60 timekeeping: Remove timespec64 hack
At this point, we have converted most of the kernel to use timespec64
consistently in place of timespec, so it seems it's time to make
timespec64 the native structure and define timespec in terms of that
one on 64-bit architectures.

Starting with gcc-5, the compiler can completely optimize away the
timespec_to_timespec64 and timespec64_to_timespec functions on 64-bit
architectures. With older compilers, we introduce a couple of extra
copies of local variables, but those are easily avoided by using
the timespec64 based interfaces consistently, as we do in most of the
important code paths already.

The main upside of removing the hack is that printing the tv_sec
field of a timespec64 structure can now use the %lld format
string on all architectures without a cast to time64_t. Without
this patch, the field is a 'long' type and would have to be printed
using %ld on 64-bit architectures.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: y2038@lists.linaro.org
Cc: John Stultz <john.stultz@linaro.org>
Link: https://lkml.kernel.org/r/20180427134016.2525989-2-arnd@arndb.de
2018-05-19 13:57:31 +02:00
Baolin Wang e142aa09ed timekeeping: Remove __current_kernel_time()
The __current_kernel_time() function based on 'struct timespec' is no
longer recommended for new code, and the only user of this function has
been replaced by commit 6909e29fde ("kdb: use __ktime_get_real_seconds
instead of __current_kernel_time").

Remove the obsolete interface.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: arnd@arndb.de
Cc: sboyd@kernel.org
Cc: broonie@kernel.org
Cc: john.stultz@linaro.org
Link: https://lkml.kernel.org/r/1a9dbea7ee2cda7efe9ed330874075cf17fdbff6.1523596316.git.baolin.wang@linaro.org
2018-04-17 17:18:05 +02:00
Arnd Bergmann 6546911ed3 time: Move old timekeeping interfaces to timekeeping32.h
The interfaces based on 'struct timespec' and 'unsigned long' seconds
are no longer recommended for new code, and we are trying to migrate to
ktime_t based interfaces and other y2038-safe variants.

This moves all the legacy interfaces from linux/timekeeping.h into a
new timekeeping32.h to better document this.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Miroslav Lichvar <mlichvar@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Stephen Boyd <stephen.boyd@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
2017-10-30 15:17:20 -07:00