[S390] cputime: add sparse checking and cleanup

Make cputime_t and cputime64_t nocast to enable sparse checking to
detect incorrect use of cputime. Drop the cputime macros for simple
scalar operations. The conversion macros are still needed.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 7 insertions, 8 deletions

diff --git a/kernel/itimer.c b/kernel/itimer.c
index d802883153da..22000c3db0dd 100644
--- a/kernel/itimer.c
+++ b/kernel/itimer.c
@@ -52,22 +52,22 @@ static void get_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
 
         cval = it->expires;
         cinterval = it->incr;
-        if (!cputime_eq(cval, cputime_zero)) {
+        if (cval) {
                 struct task_cputime cputime;
                 cputime_t t;
 
                 thread_group_cputimer(tsk, &cputime);
                 if (clock_id == CPUCLOCK_PROF)
-                        t = cputime_add(cputime.utime, cputime.stime);
+                        t = cputime.utime + cputime.stime;
                 else
                         /* CPUCLOCK_VIRT */
                         t = cputime.utime;
 
-                if (cputime_le(cval, t))
+                if (cval < t)
                         /* about to fire */
                         cval = cputime_one_jiffy;
                 else
-                        cval = cputime_sub(cval, t);
+                        cval = cval - t;
         }
 
         spin_unlock_irq(&tsk->sighand->siglock);
@@ -161,10 +161,9 @@ static void set_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
 
         cval = it->expires;
         cinterval = it->incr;
-        if (!cputime_eq(cval, cputime_zero) ||
-            !cputime_eq(nval, cputime_zero)) {
-                if (cputime_gt(nval, cputime_zero))
-                        nval = cputime_add(nval, cputime_one_jiffy);
+        if (cval || nval) {
+                if (nval > 0)
+                        nval += cputime_one_jiffy;
                 set_process_cpu_timer(tsk, clock_id, &nval, &cval);
         }
         it->expires = nval;