linux-kernel - [PATCH RFC 06/12] time: Fix build warnings for time64_t to __kernel_time

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Date:	Mon, 27 Oct 2014 13:46:36 +0800
From:	"pang.xunlei" <pang.xunlei@...aro.org>
To:	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com
Cc:	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	"pang.xunlei" <pang.xunlei@...aro.org>
Subject: [PATCH RFC 06/12] time: Fix build warnings for time64_t to __kernel_time_t warning on 64-bit systems.

The kernel uses 32-bit signed value(time_t) for seconds since 1970-01-01:00:00:00, so it
will overflow at 2038-01-19 03:14:08 on 32-bit systems. We call this "2038 safety" issue.

This patch fixed the build warnings brought by former patches.

Signed-off-by: pang.xunlei <pang.xunlei@...aro.org>
---
 include/linux/time64.h |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/time64.h b/include/linux/time64.h
index a383147..02f2c87 100644
--- a/include/linux/time64.h
+++ b/include/linux/time64.h
@@ -3,15 +3,15 @@
 
 #include <uapi/linux/time.h>
 
-typedef __s64 time64_t;
-
 /*
  * This wants to go into uapi/linux/time.h once we agreed about the
  * userspace interfaces.
  */
 #if __BITS_PER_LONG == 64
-# define timespec64 timespec
+typedef __kernel_time_t time64_t;
+#define timespec64 timespec
 #else
+typedef __s64 time64_t;
 struct timespec64 {
 	time64_t	tv_sec;			/* seconds */
 	long		tv_nsec;		/* nanoseconds */
-- 
1.7.9.5

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