From: Eric Paris <eparis@parisplace.org>
To: Sasha Levin <levinsasha928@gmail.com>
Cc: viro@zeniv.linux.org.uk, rostedt@goodmis.org, fweisbec@gmail.com,
mingo@redhat.com, a.p.zijlstra@chello.nl, paulus@samba.org,
acme@ghostprotocols.net, james.l.morris@oracle.com,
ebiederm@xmission.com, akpm@linux-foundation.org,
tglx@linutronix.de, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-security-module@vger.kernel.org
Subject: Re: [PATCH 03/14] sched rt,sysctl: remove proc input checks out of sysctl handlers
Date: Sun, 29 Apr 2012 22:32:43 -0400 [thread overview]
Message-ID: <CACLa4ptMy0GkS=XSGVOPx4Ba2HN+N2EyK50BARr2xaOXfvDqcg@mail.gmail.com> (raw)
In-Reply-To: <1335681937-3715-3-git-send-email-levinsasha928@gmail.com>
NAK
old_period = sysctl_sched_rt_period;
Doesn't make any sense in the callback, since you already updated
sysctl_sched_rt_period.
I'll leave the remainder of the series as an exercise for the reader.
But I get the feeling this isn't the only place where you are doing
things after the proc_dointvec() which must be done before.
-Eric
On Sun, Apr 29, 2012 at 2:45 AM, Sasha Levin <levinsasha928@gmail.com> wrote:
> Simplify sysctl handler by removing user input checks and using the callback
> provided by the sysctl table.
>
> Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
> ---
> include/linux/sched.h | 4 +---
> kernel/sched/core.c | 25 ++++++++++---------------
> kernel/sysctl.c | 6 ++++--
> 3 files changed, 15 insertions(+), 20 deletions(-)
>
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 722da9a..9509d80 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -2152,9 +2152,7 @@ static inline unsigned int get_sysctl_timer_migration(void)
> extern unsigned int sysctl_sched_rt_period;
> extern int sysctl_sched_rt_runtime;
>
> -int sched_rt_handler(struct ctl_table *table, int write,
> - void __user *buffer, size_t *lenp,
> - loff_t *ppos);
> +int sched_rt_handler(void);
>
> #ifdef CONFIG_SCHED_AUTOGROUP
> extern unsigned int sysctl_sched_autogroup_enabled;
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 477b998..ca4a806 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -7573,9 +7573,7 @@ static int sched_rt_global_constraints(void)
> }
> #endif /* CONFIG_RT_GROUP_SCHED */
>
> -int sched_rt_handler(struct ctl_table *table, int write,
> - void __user *buffer, size_t *lenp,
> - loff_t *ppos)
> +int sched_rt_handler(void)
> {
> int ret;
> int old_period, old_runtime;
> @@ -7585,19 +7583,16 @@ int sched_rt_handler(struct ctl_table *table, int write,
> old_period = sysctl_sched_rt_period;
> old_runtime = sysctl_sched_rt_runtime;
>
> - ret = proc_dointvec(table, write, buffer, lenp, ppos);
> -
> - if (!ret && write) {
> - ret = sched_rt_global_constraints();
> - if (ret) {
> - sysctl_sched_rt_period = old_period;
> - sysctl_sched_rt_runtime = old_runtime;
> - } else {
> - def_rt_bandwidth.rt_runtime = global_rt_runtime();
> - def_rt_bandwidth.rt_period =
> - ns_to_ktime(global_rt_period());
> - }
> + ret = sched_rt_global_constraints();
> + if (ret) {
> + sysctl_sched_rt_period = old_period;
> + sysctl_sched_rt_runtime = old_runtime;
> + } else {
> + def_rt_bandwidth.rt_runtime = global_rt_runtime();
> + def_rt_bandwidth.rt_period =
> + ns_to_ktime(global_rt_period());
> }
> +
> mutex_unlock(&mutex);
>
> return ret;
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 23f1ac6..fad9ff6 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -347,14 +347,16 @@ static struct ctl_table kern_table[] = {
> .data = &sysctl_sched_rt_period,
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> - .proc_handler = sched_rt_handler,
> + .proc_handler = proc_dointvec,
> + .callback = sched_rt_handler,
> },
> {
> .procname = "sched_rt_runtime_us",
> .data = &sysctl_sched_rt_runtime,
> .maxlen = sizeof(int),
> .mode = 0644,
> - .proc_handler = sched_rt_handler,
> + .proc_handler = proc_dointvec,
> + .callback = sched_rt_handler,
> },
> #ifdef CONFIG_SCHED_AUTOGROUP
> {
> --
> 1.7.8.5
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> Please read the FAQ at http://www.tux.org/lkml/
next prev parent reply other threads:[~2012-04-30 2:32 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-29 6:45 [PATCH 01/14] sysctl: provide callback for write into ctl_table entry Sasha Levin
2012-04-29 6:45 ` [PATCH 02/14] sched debug,sysctl: remove proc input checks out of sysctl handlers Sasha Levin
2012-04-29 6:45 ` [PATCH 03/14] sched rt,sysctl: " Sasha Levin
2012-04-30 2:32 ` Eric Paris [this message]
2012-04-29 6:45 ` [PATCH 04/14] ftrace,sysctl: " Sasha Levin
2012-04-29 6:45 ` [PATCH 05/14] sysrq,sysctl: " Sasha Levin
2012-04-29 6:45 ` [PATCH 06/14] watchdog,sysctl: remove unused external Sasha Levin
2012-04-29 6:45 ` [PATCH 07/14] watchdog,sysctl: remove proc input checks out of sysctl handlers Sasha Levin
2012-04-29 6:45 ` [PATCH 08/14] hung task,sysctl: " Sasha Levin
2012-04-29 6:45 ` [PATCH 09/14] perf,sysctl: " Sasha Levin
2012-04-29 6:45 ` [PATCH 10/14] mm,sysctl: " Sasha Levin
2012-04-29 6:45 ` [PATCH 11/14] hugetlb,sysctl: " Sasha Levin
2012-04-29 6:45 ` [PATCH 12/14] mm compaction,sysctl: " Sasha Levin
2012-04-29 6:45 ` [PATCH 13/14] security,sysctl: " Sasha Levin
2012-04-30 2:28 ` Eric Paris
2012-04-29 6:45 ` [PATCH 14/14] fs,sysctl: " Sasha Levin
2012-04-29 8:22 ` [PATCH 01/14] sysctl: provide callback for write into ctl_table entry Eric W. Biederman
2012-04-29 12:07 ` Sasha Levin
2012-04-29 14:00 ` Steven Rostedt
2012-04-29 14:14 ` Sasha Levin
2012-04-29 19:57 ` Steven Rostedt
2012-04-30 2:52 ` Eric W. Biederman
2012-04-29 12:26 ` Sasha Levin
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