posix-cpu-timers: Simplify set_process_cpu_timer()

The expiry cache can now be accessed as an array. Replace the per clock
checks with a simple comparison of the clock indexed array member.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lkml.kernel.org/r/20190821192921.303316423@linutronix.de

diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index b132417..2c47ce6 100644 (file)
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -1174,15 +1174,15 @@ void run_posix_cpu_timers(void)
  * Set one of the process-wide special case CPU timers or RLIMIT_CPU.
  * The tsk->sighand->siglock must be held by the caller.
  */
-void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
+void set_process_cpu_timer(struct task_struct *tsk, unsigned int clkid,
                           u64 *newval, u64 *oldval)
 {
-       u64 now;
+       u64 now, *expiry = tsk->signal->posix_cputimers.expiries + clkid;
 
-       if (WARN_ON_ONCE(clock_idx >= CPUCLOCK_SCHED))
+       if (WARN_ON_ONCE(clkid >= CPUCLOCK_SCHED))
                return;
 
-       now = cpu_clock_sample_group(clock_idx, tsk, true);
+       now = cpu_clock_sample_group(clkid, tsk, true);
 
        if (oldval) {
                /*
@@ -1205,19 +1205,11 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
        }
 
        /*
-        * Update expiration cache if we are the earliest timer, or eventually
-        * RLIMIT_CPU limit is earlier than prof_exp cpu timer expire.
+        * Update expiration cache if this is the earliest timer. CPUCLOCK_PROF
+        * expiry cache is also used by RLIMIT_CPU!.
         */
-       switch (clock_idx) {
-       case CPUCLOCK_PROF:
-               if (expires_gt(tsk->signal->posix_cputimers.cputime_expires.prof_exp, *newval))
-                       tsk->signal->posix_cputimers.cputime_expires.prof_exp = *newval;
-               break;
-       case CPUCLOCK_VIRT:
-               if (expires_gt(tsk->signal->posix_cputimers.cputime_expires.virt_exp, *newval))
-                       tsk->signal->posix_cputimers.cputime_expires.virt_exp = *newval;
-               break;
-       }
+       if (expires_gt(*expiry, *newval))
+               *expiry = *newval;
 
        tick_dep_set_signal(tsk->signal, TICK_DEP_BIT_POSIX_TIMER);
 }