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kdb: use ktime_get_mono_fast_ns() instead of ktime_get_ts() 

The kdb code will print the monotonic time by ktime_get_ts(), but
the ktime_get_ts() will be protected by a sequence lock, that will
introduce one deadlock risk if the lock was already held in the
context from which we entered the debugger.

Thus we can use the ktime_get_mono_fast_ns() to get the monotonic
time, which is NMI safe access to clock monotonic. Moreover we can
remove the 'struct timespec', which is not y2038 safe.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
This commit is contained in:
Baolin Wang 2018-01-29 10:22:51 +08:00 committed by Jason Wessel
parent 33f765f698
commit 40b90efeae
1 changed files with 3 additions and 3 deletions
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6
kernel/debug/kdb/kdb_main.c
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@ -2512,10 +2512,10 @@ static int kdb_kill(int argc, const char **argv)
*/
static void kdb_sysinfo(struct sysinfo *val)
{
struct timespec uptime;
ktime_get_ts(&uptime);
u64 uptime = ktime_get_mono_fast_ns();
memset(val, 0, sizeof(*val));
val->uptime = uptime.tv_sec;
val->uptime = div_u64(uptime, NSEC_PER_SEC);
val->loads[0] = avenrun[0];
val->loads[1] = avenrun[1];
val->loads[2] = avenrun[2];