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Commit 40b90efe authored by Baolin Wang's avatar Baolin Wang Committed by Jason Wessel
Browse files

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: default avatarBaolin Wang <baolin.wang@linaro.org>
Reviewed-by: default avatarDaniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarJason Wessel <jason.wessel@windriver.com>
parent 33f765f6

kernel/debug/kdb/kdb_main.c

+3 −3
Original line number Original line Diff line number Diff line
@@ -2512,10 +2512,10 @@ static int kdb_kill(int argc, const char **argv) 
 */

 */

static void kdb_sysinfo(struct sysinfo *val)

static void kdb_sysinfo(struct sysinfo *val)

{

{

	struct timespec uptime;

	u64 uptime = ktime_get_mono_fast_ns();

	ktime_get_ts(&uptime);



	memset(val, 0, sizeof(*val));

	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[0] = avenrun[0];

	val->loads[1] = avenrun[1];

	val->loads[1] = avenrun[1];

	val->loads[2] = avenrun[2];

	val->loads[2] = avenrun[2];