From 2019e8a3024bd8fcadd57891a88c838849216a5f Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Mon, 27 Oct 2014 17:20:35 +0100 Subject: [PATCH] alpha: Fix jiffies based cputime assumption That code wrongly assumes that cputime_t wraps jiffies_t. Lets use the correct accessors/mutators. In practice there should be no harm yet because alpha currently only support tick based cputime accounting which is always jiffies based. Reviewed-by: Rik van Riel Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Christoph Lameter Cc: Ingo Molnar Cc; John Stultz Cc: Peter Zijlstra Cc: Preeti U Murthy Cc: Rik van Riel Cc: Thomas Gleixner Cc: Viresh Kumar Signed-off-by: Frederic Weisbecker --- arch/alpha/kernel/osf_sys.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c index 36dc91ace83a..6cc08166ff00 100644 --- a/arch/alpha/kernel/osf_sys.c +++ b/arch/alpha/kernel/osf_sys.c @@ -1138,6 +1138,7 @@ SYSCALL_DEFINE2(osf_getrusage, int, who, struct rusage32 __user *, ru) { struct rusage32 r; cputime_t utime, stime; + unsigned long utime_jiffies, stime_jiffies; if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN) return -EINVAL; @@ -1146,14 +1147,18 @@ SYSCALL_DEFINE2(osf_getrusage, int, who, struct rusage32 __user *, ru) switch (who) { case RUSAGE_SELF: task_cputime(current, &utime, &stime); - jiffies_to_timeval32(utime, &r.ru_utime); - jiffies_to_timeval32(stime, &r.ru_stime); + utime_jiffies = cputime_to_jiffies(utime); + stime_jiffies = cputime_to_jiffies(stime); + jiffies_to_timeval32(utime_jiffies, &r.ru_utime); + jiffies_to_timeval32(stime_jiffies, &r.ru_stime); r.ru_minflt = current->min_flt; r.ru_majflt = current->maj_flt; break; case RUSAGE_CHILDREN: - jiffies_to_timeval32(current->signal->cutime, &r.ru_utime); - jiffies_to_timeval32(current->signal->cstime, &r.ru_stime); + utime_jiffies = cputime_to_jiffies(current->signal->cutime); + stime_jiffies = cputime_to_jiffies(current->signal->cstime); + jiffies_to_timeval32(utime_jiffies, &r.ru_utime); + jiffies_to_timeval32(stime_jiffies, &r.ru_stime); r.ru_minflt = current->signal->cmin_flt; r.ru_majflt = current->signal->cmaj_flt; break;