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posix-cpu-timers: Create a container struct

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Per task/process data of posix CPU timers is all over the place which
makes the code hard to follow and requires ifdeffery.

Create a container to hold all this information in one place, so data is
consolidated and the ifdeffery can be confined to the posix timer header
file and removed from places like fork.

As a first step, move the cpu_timers list head array into the new struct
and clean up the initializers and simplify fork. The remaining #ifdef in
fork will be removed later.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lkml.kernel.org/r/20190821192920.819418976@linutronix.de
This commit is contained in:
Thomas Gleixner 2019-08-21 21:09:04 +02:00
parent ab693c5a5e
commit 2b69942f90
6 changed files with 54 additions and 31 deletions
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11
include/linux/init_task.h
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@ -36,17 +36,6 @@ extern struct cred init_cred;
#define INIT_PREV_CPUTIME(x)
#endif
#ifdef CONFIG_POSIX_TIMERS
#define INIT_CPU_TIMERS(s) \
.cpu_timers = { \
LIST_HEAD_INIT(s.cpu_timers[0]), \
LIST_HEAD_INIT(s.cpu_timers[1]), \
LIST_HEAD_INIT(s.cpu_timers[2]), \
},
#else
#define INIT_CPU_TIMERS(s)
#endif
#define INIT_TASK_COMM "swapper"
/* Attach to the init_task data structure for proper alignment */