delayacct: fix uapi timespec64 definition

The custom definition of 'struct timespec64' is incompatible with both the
kernel's internal definition and the glibc type, at least on big-endian
targets that have the tv_nsec field in a different place, and the
definition clashes with any userspace that also defines a timespec64
structure.

Running the header check with -Wpadding enabled produces this output that
warns about the incorrect padding:

usr/include/linux/taskstats.h:25:1: error: padding struct size to alignment boundary with 4 bytes [-Werror=padded]

Remove the hack and instead use the regular __kernel_timespec type that is
meant to be used in uapi definitions.

Link: https://lkml.kernel.org/r/20260202095906.1344100-1-arnd@kernel.org
Fixes: 29b63f6 ("delayacct: add timestamp of delay max")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Fan Yu <fan.yu9@zte.com.cn>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: xu xin <xu.xin16@zte.com.cn>
Cc: Yang Yang <yang.yang29@zte.com.cn>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Jiang Kun <jiang.kun2@zte.com.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: arndb

include/uapi/linux/taskstats.h

@@ -18,16 +18,7 @@
 #define _LINUX_TASKSTATS_H
 
 #include <linux/types.h>
-#ifdef __KERNEL__
-#include <linux/time64.h>
-#else
-#ifndef _LINUX_TIME64_H
-struct timespec64 {
-	__s64   tv_sec;         /* seconds */
-	long    tv_nsec;        /* nanoseconds */
-};
-#endif
-#endif
+#include <linux/time_types.h>
 
 /* Format for per-task data returned to userland when
  *	- a task exits
@@ -242,14 +233,14 @@ struct taskstats {
 	__u64	irq_delay_min;
 
 	/*v17: delay max timestamp record*/
-	struct timespec64 cpu_delay_max_ts;
-	struct timespec64 blkio_delay_max_ts;
-	struct timespec64 swapin_delay_max_ts;
-	struct timespec64 freepages_delay_max_ts;
-	struct timespec64 thrashing_delay_max_ts;
-	struct timespec64 compact_delay_max_ts;
-	struct timespec64 wpcopy_delay_max_ts;
-	struct timespec64 irq_delay_max_ts;
+	struct __kernel_timespec cpu_delay_max_ts;
+	struct __kernel_timespec blkio_delay_max_ts;
+	struct __kernel_timespec swapin_delay_max_ts;
+	struct __kernel_timespec freepages_delay_max_ts;
+	struct __kernel_timespec thrashing_delay_max_ts;
+	struct __kernel_timespec compact_delay_max_ts;
+	struct __kernel_timespec wpcopy_delay_max_ts;
+	struct __kernel_timespec irq_delay_max_ts;
 };
 
 

kernel/delayacct.c

@@ -18,7 +18,8 @@
 do { \
 	d->type##_delay_max = tsk->delays->type##_delay_max; \
 	d->type##_delay_min = tsk->delays->type##_delay_min; \
-	d->type##_delay_max_ts = tsk->delays->type##_delay_max_ts; \
+	d->type##_delay_max_ts.tv_sec = tsk->delays->type##_delay_max_ts.tv_sec; \
+	d->type##_delay_max_ts.tv_nsec = tsk->delays->type##_delay_max_ts.tv_nsec; \
 	tmp = d->type##_delay_total + tsk->delays->type##_delay; \
 	d->type##_delay_total = (tmp < d->type##_delay_total) ? 0 : tmp; \
 	d->type##_count += tsk->delays->type##_count; \
@@ -175,7 +176,8 @@ int delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
 
 	d->cpu_delay_max = tsk->sched_info.max_run_delay;
 	d->cpu_delay_min = tsk->sched_info.min_run_delay;
-	d->cpu_delay_max_ts = tsk->sched_info.max_run_delay_ts;
+	d->cpu_delay_max_ts.tv_sec = tsk->sched_info.max_run_delay_ts.tv_sec;
+	d->cpu_delay_max_ts.tv_nsec = tsk->sched_info.max_run_delay_ts.tv_nsec;
 	tmp = (s64)d->cpu_delay_total + t2;
 	d->cpu_delay_total = (tmp < (s64)d->cpu_delay_total) ? 0 : tmp;
 	tmp = (s64)d->cpu_run_virtual_total + t3;