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authorDavid Howells <dhowells@redhat.com>2008-07-25 01:48:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:47 -0700
commit3e85ba034deec351f02cb55ff225bbd616463841 (patch)
tree104931bdb095bd9f7cb987e50800a036b0c2dcb4
parent297c5d92634c809cef23d73e7b2556f2528ff7e2 (diff)
tsacct: fix bacct_add_tsk()'s use of do_div()
Fix bacct_add_tsk()'s use of do_div() on an s64 by making ac_etime a u64 instead and dividing that. Possibly this should be guarded lest the interval calculation turn up negative, but the possible negativity of the result of the division is cast away, and it shouldn't end up negative anyway. This was introduced by patch f3cef7a99469afc159fec3a61b42dc7ca5b6824f. Signed-off-by: David Howells <dhowells@redhat.com> Cc: Jay Lan <jlan@engr.sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/tsacct.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 1da6990af8e..3da47ccdc5e 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -28,14 +28,14 @@
void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
{
struct timespec uptime, ts;
- s64 ac_etime;
+ u64 ac_etime;
BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
/* calculate task elapsed time in timespec */
do_posix_clock_monotonic_gettime(&uptime);
ts = timespec_sub(uptime, tsk->start_time);
- /* rebase elapsed time to usec */
+ /* rebase elapsed time to usec (should never be negative) */
ac_etime = timespec_to_ns(&ts);
do_div(ac_etime, NSEC_PER_USEC);
stats->ac_etime = ac_etime;