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

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Date:	Thu, 28 Jan 2016 09:22:04 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	zengtao <prime.zeng@...wei.com>
cc:	LKML <linux-kernel@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] cputime: Fix timeval-->cputime conversion

Cc'ing Arnd

On Thu, 28 Jan 2016, zengtao wrote:

> 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>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>

> ---
>  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
> 
>