[PATCH] Fix for sys_nanosleep() in 2.4.16

[Michael Arras]

Greetings,

For many of us, the kernel thread scheduling resolution is
10ms (see getitimer(2)).  By adding 1 jiffy to the time to
sleep in sys_nanosleep(), threads are sleeping 10ms too long.
timespec_to_jiffies() does a good job at returning the
appropriate number of jiffies to sleep.  There is no need to
add one for good measure.

Mike Arras
[e-mail]

diff -urN linux-2.4.16/kernel/timer.c linux/kernel/timer.c
--- linux-2.4.16/kernel/timer.c Mon Oct  8 13:41:41 2001
+++ linux/kernel/timer.c        Wed Nov 28 00:23:15 2001
@@ -825,7 +825,7 @@
                return 0;
        }
 
-       expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);
+       expire = timespec_to_jiffies(&t);
 
        current->state = TASK_INTERRUPTIBLE;
        expire = schedule_timeout(expire);