linux-kernel - [PATCH] timekeeping: warning when persistent clock is not available

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Message-Id: <20180725200018.23722-1-pasha.tatashin@oracle.com>
Date:   Wed, 25 Jul 2018 16:00:18 -0400
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     steven.sistare@...cle.com, daniel.m.jordan@...cle.com,
        x86@...nel.org, linux-kernel@...r.kernel.org, tglx@...utronix.de,
        sboyd@...nel.org, pasha.tatashin@...cle.com, john.stultz@...aro.org
Subject: [PATCH] timekeeping: warning when persistent clock is not available

On arches with no persistent clock a message like this is printed during
boot:

[    0.000000] Persistent clock returned invalid value

The value is not invalid: it simply zero meaning no persistent clock and
the absence of persistent clock should be quietly accepted.

Fixes: 3eca993740b8 ("timekeeping: Replace read_boot_clock64() with read_persistent_wall_and_boot_offset()")

Signed-off-by: Pavel Tatashin <pasha.tatashin@...cle.com>
---
 kernel/time/timekeeping.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index edf5da78a449..f3b22f456fac 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1557,7 +1557,7 @@ void __init timekeeping_init(void)
 	if (timespec64_valid_strict(&wall_time) &&
 	    timespec64_to_ns(&wall_time) > 0) {
 		persistent_clock_exists = true;
-	} else {
+	} else if (timespec64_to_ns(&wall_time) != 0) {
 		pr_warn("Persistent clock returned invalid value");
 		wall_time = (struct timespec64){0};
 	}
-- 
2.18.0