linux-kernel - Re: [Y2038] [PATCH 01/23] y2038: remove CONFIG_64BIT

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Message-ID: <638f6bcc2f7ecf96eda85973457a8d69b0a7640e.camel@codethink.co.uk>
Date:   Wed, 20 Nov 2019 22:28:23 +0000
From:   Ben Hutchings <ben.hutchings@...ethink.co.uk>
To:     Arnd Bergmann <arnd@...db.de>, y2038@...ts.linaro.org,
        Thomas Gleixner <tglx@...utronix.de>,
        John Stultz <john.stultz@...aro.org>
Cc:     linux-aio@...ck.org, Stephen Boyd <sboyd@...nel.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Benjamin LaHaise <bcrl@...ck.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Dmitry Safonov <dima@...sta.com>
Subject: Re: [Y2038] [PATCH 01/23] y2038: remove CONFIG_64BIT_TIME

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 <dima@...sta.com>
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