posix-timers: Make them configurable
authorNicolas Pitre <nicolas.pitre@linaro.org>
Fri, 11 Nov 2016 05:10:10 +0000 (00:10 -0500)
committerThomas Gleixner <tglx@linutronix.de>
Wed, 16 Nov 2016 08:26:35 +0000 (09:26 +0100)
commitbaa73d9e478ff32d62f3f9422822b59dd9a95a21
treeec1ac1b90e4a6c6337acb564d7fb518418fc510f
parent53d3eaa31508222e445b489f3c3ac4c63542a4ef
posix-timers: Make them configurable

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 <nico@linaro.org>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <john.stultz@linaro.org>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Cc: Paul Bolle <pebolle@tiscali.nl>
Cc: linux-kbuild@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: Michal Marek <mmarek@suse.com>
Cc: Edward Cree <ecree@solarflare.com>
Link: http://lkml.kernel.org/r/1478841010-28605-7-git-send-email-nicolas.pitre@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
15 files changed:
arch/alpha/kernel/osf_sys.c
drivers/char/Kconfig
drivers/ptp/Kconfig
fs/exec.c
init/Kconfig
kernel/compat.c
kernel/exit.c
kernel/fork.c
kernel/signal.c
kernel/sys.c
kernel/time/Makefile
kernel/time/alarmtimer.c
kernel/time/posix-stubs.c [new file with mode: 0644]
kernel/time/timer.c
security/selinux/hooks.c