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procfs: avoid 32-bit time_t in /proc/*/stat 

/proc/stat shows (among lots of other things) the current boottime (i.e.
number of seconds since boot).  While a 32-bit number is sufficient for
this particular case, we want to get rid of the 'struct timespec'
suffers from a 32-bit overflow in 2038.

This changes the code to use a struct timespec64, which is known to be
safe in all cases.

Link: http://lkml.kernel.org/r/20160617201247.2292101-1-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Arnd Bergmann 2016-08-02 14:03:22 -07:00 committed by Linus Torvalds
parent ef419398b6
commit 519ded5a89
1 changed files with 4 additions and 6 deletions
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10
fs/proc/stat.c
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@ -80,19 +80,17 @@ static u64 get_iowait_time(int cpu)
static int show_stat(struct seq_file *p, void *v)
{
int i, j;
unsigned long jif;
u64 user, nice, system, idle, iowait, irq, softirq, steal;
u64 guest, guest_nice;
u64 sum = 0;
u64 sum_softirq = 0;
unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
struct timespec boottime;
struct timespec64 boottime;
user = nice = system = idle = iowait =
irq = softirq = steal = 0;
guest = guest_nice = 0;
getboottime(&boottime);
jif = boottime.tv_sec;
getboottime64(&boottime);
for_each_possible_cpu(i) {
user += kcpustat_cpu(i).cpustat[CPUTIME_USER];
@ -163,12 +161,12 @@ static int show_stat(struct seq_file *p, void *v)
seq_printf(p,
"\nctxt %llu\n"
"btime %lu\n"
"btime %llu\n"
"processes %lu\n"
"procs_running %lu\n"
"procs_blocked %lu\n",
nr_context_switches(),
(unsigned long)jif,
(unsigned long long)boottime.tv_sec,
total_forks,
nr_running(),
nr_iowait());