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posix-timers: Make them configurable

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Some embedded systems have no use for them.  This removes about
25KB from the kernel binary size when configured out.

Corresponding syscalls are routed to a stub logging the attempt to
use those syscalls which should be enough of a clue if they were
disabled without proper consideration. They are: timer_create,
timer_gettime: timer_getoverrun, timer_settime, timer_delete,
clock_adjtime, setitimer, getitimer, alarm.

The clock_settime, clock_gettime, clock_getres and clock_nanosleep
syscalls are replaced by simple wrappers compatible with CLOCK_REALTIME,
CLOCK_MONOTONIC and CLOCK_BOOTTIME only which should cover the vast
majority of use cases with very little code.

Signed-off-by: Nicolas Pitre <[email protected]>
Acked-by: Richard Cochran <[email protected]>
Acked-by: Thomas Gleixner <[email protected]>
Acked-by: John Stultz <[email protected]>
Reviewed-by: Josh Triplett <[email protected]>
Cc: Paul Bolle <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Michal Marek <[email protected]>
Cc: Edward Cree <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Nicolas Pitre 2016-11-11 00:10:10 -05:00 • committed by Thomas Gleixner
commit baa73d9e47
15 changed files with 200 additions and 13 deletions
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2
drivers/ptp/Kconfig
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@ -6,7 +6,7 @@ menu "PTP clock support"
config PTP_1588_CLOCK
tristate "PTP clock support"
depends on NET
depends on NET && POSIX_TIMERS
select PPS
select NET_PTP_CLASSIFY
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