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delayacct: fix uapi timespec64 definition

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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: 29b63f6eff0e ("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>
This commit is contained in:
Arnd Bergmann 2026-02-02 10:59:00 +01:00 • committed by Andrew Morton
parent 2e171ab29f
commit 90079798f1
2 changed files with 13 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

27
include/uapi/linux/taskstats.h
View file

@ -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;
};

6
kernel/delayacct.c
View file

@ -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;