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| author | Yajun Deng <yajun.deng@linux.dev> | 2022-06-07 13:18:07 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-06-13 11:30:00 +0300 |
| commit | 2ed81e765417ec2526f901366167a13294ef09ce (patch) | |
| tree | 9f30c3f54d330a73ec7225418039a6d111293516 /kernel/sched/deadline.c | |
| parent | 51bf903b64bdde4e4c9009a9e2b4a589845d9d81 (diff) | |
| download | linux-2ed81e765417ec2526f901366167a13294ef09ce.tar.xz | |
sched/deadline: Use proc_douintvec_minmax() limit minimum value
sysctl_sched_dl_period_max and sysctl_sched_dl_period_min are unsigned
integer, but proc_dointvec() wouldn't return error even if we set a
negative number.
Use proc_douintvec_minmax() instead of proc_dointvec(). Add extra1 for
sysctl_sched_dl_period_max and extra2 for sysctl_sched_dl_period_min.
It's just an optimization for match data and proc_handler in struct
ctl_table. The 'if (period < min || period > max)' in __checkparam_dl()
will work fine even if there hasn't this patch.
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Link: https://lore.kernel.org/r/20220607101807.249965-1-yajun.deng@linux.dev
Diffstat (limited to 'kernel/sched/deadline.c')
| -rw-r--r-- | kernel/sched/deadline.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index b5152961b743..5867e186c39a 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -30,14 +30,16 @@ static struct ctl_table sched_dl_sysctls[] = { .data = &sysctl_sched_dl_period_max, .maxlen = sizeof(unsigned int), .mode = 0644, - .proc_handler = proc_dointvec, + .proc_handler = proc_douintvec_minmax, + .extra1 = (void *)&sysctl_sched_dl_period_min, }, { .procname = "sched_deadline_period_min_us", .data = &sysctl_sched_dl_period_min, .maxlen = sizeof(unsigned int), .mode = 0644, - .proc_handler = proc_dointvec, + .proc_handler = proc_douintvec_minmax, + .extra2 = (void *)&sysctl_sched_dl_period_max, }, {} }; |