# Re: \[Y2038\] \[PATCH 01/23\] y2038: remove CONFIG\_64BIT\_TIME

- From: Ben Hutchings \<hidden\>
- Date: 2019-11-20 22:28:40 
- List: netdev
- Page: https://ratatoskr.run/netdev/2019/11/167295
- Thread: https://ratatoskr.run/netdev/2019/11/166384/t.md

```text
On Fri, 2019-11-08 at 22:07 +0100, Arnd Bergmann wrote:
[...]
> --- a/kernel/time/time.c
> +++ b/kernel/time/time.c
> @@ -267,7 +267,7 @@ COMPAT_SYSCALL_DEFINE2(settimeofday, struct old_timeval32 __user *, tv,
>  }
>  #endif
>  
> -#if !defined(CONFIG_64BIT_TIME) || defined(CONFIG_64BIT)
> +#ifdef CONFIG_64BIT
>  SYSCALL_DEFINE1(adjtimex, struct __kernel_timex __user *, txc_p)
>  {
>  	struct __kernel_timex txc;		/* Local copy of parameter */
> @@ -884,7 +884,7 @@ int get_timespec64(struct timespec64 *ts,
>  	ts->tv_sec = kts.tv_sec;
>  
>  	/* Zero out the padding for 32 bit systems or in compat mode */
> -	if (IS_ENABLED(CONFIG_64BIT_TIME) && in_compat_syscall())
> +	if (in_compat_syscall())
>  		kts.tv_nsec &= 0xFFFFFFFFUL;
>  
>  	ts->tv_nsec = kts.tv_nsec;
[...]

It's not a problem with this patch, but I noticed that this condition
doesn't match what the comment says.  It looks like it was broken by:

commit 98f76206b33504b934209d16196477dfa519a807
Author: Dmitry Safonov [ref]
Date:   Fri Oct 12 14:42:53 2018 +0100

    compat: Cleanup in_compat_syscall() callers

Ben.

-- 
Ben Hutchings, Software Developer                         Codethink Ltd
https://www.codethink.co.uk/                 Dale House, 35 Dale Street
                                     Manchester, M1 2HF, United Kingdom

```