linux-kernel - [PATCH] cputime: Fix timeval-->cputime conversion

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Message-ID: <1453964546-111074-1-git-send-email-prime.zeng@huawei.com>
Date:	Thu, 28 Jan 2016 15:02:26 +0800
From:	zengtao <prime.zeng@...wei.com>
To:	<tglx@...utronix.de>
CC:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] cputime: Fix timeval-->cputime conversion

The structure:
struct timeval {
	__kernel_time_t		tv_sec;		/* seconds */
	__kernel_suseconds_t	tv_usec;	/* microseconds */
};
both __kernel_time_t and __kernel_suseconds_t are short than u64
when it is 32bit platform, so force u64 conversion here.

Signed-off-by: zengtao <prime.zeng@...wei.com>
---
 include/asm-generic/cputime_nsecs.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/asm-generic/cputime_nsecs.h b/include/asm-generic/cputime_nsecs.h
index 0419485..e2f7ff9 100644
--- a/include/asm-generic/cputime_nsecs.h
+++ b/include/asm-generic/cputime_nsecs.h
@@ -91,7 +91,8 @@ static inline void cputime_to_timespec(const cputime_t ct, struct timespec *val)
  */
 static inline cputime_t timeval_to_cputime(const struct timeval *val)
 {
-	u64 ret = val->tv_sec * NSEC_PER_SEC + val->tv_usec * NSEC_PER_USEC;
+	u64 ret = (u64)val->tv_sec * NSEC_PER_SEC +
+			val->tv_usec * NSEC_PER_USEC;
 	return (__force cputime_t) ret;
 }
 static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val)
-- 
1.9.1