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[3/3] time: clocksource: Add a comment to CLOCK_SOURCE_SUSPEND_NONSTOP

Message ID 1421772090-13113-3-git-send-email-pang.xunlei@linaro.org
State New
Headers show

Commit Message

pang.xunlei Jan. 20, 2015, 4:41 p.m. UTC 
When doing timekeeping_resume(), if the nonstop clocksource wraps
back, "cycle_delta" will miss the wrap time.

So add a comment to indicate that if have this flag set, you are
aware that this nonstop clocksource won't wrap during suspension.

Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org>
---
 include/linux/clocksource.h | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index abcafaa..20bca76 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -207,6 +207,11 @@  struct clocksource {
 #define CLOCK_SOURCE_WATCHDOG			0x10
 #define CLOCK_SOURCE_VALID_FOR_HRES		0x20
 #define CLOCK_SOURCE_UNSTABLE			0x40
+
+/*
+ * Setting this flag, also means it doesn't wrap back during
+ * system suspend/resume. See timekeeping_resume().
+ */
 #define CLOCK_SOURCE_SUSPEND_NONSTOP		0x80
 #define CLOCK_SOURCE_RESELECT			0x100