On 11/20/19 10:28 PM, Ben Hutchings wrote:

On Fri, 2019-11-08 at 22:07 +0100, Arnd Bergmann wrote:
[...]

quoted

--- 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 [off-list ref]
Date:   Fri Oct 12 14:42:53 2018 +0100

    compat: Cleanup in_compat_syscall() callers

Ugh, you right. I've failed to read the condition and thought it's
related to CONFIG_COMPAT :(
I'll send a fix shortly, thanks for spotting this!

-- 
          Dmitry