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Message-ID: <m1sl6vezrk.fsf@ebiederm.dsl.xmission.com>
Date: Tue, 07 Aug 2007 16:38:39 -0600
From: ebiederm@...ssion.com (Eric W. Biederman)
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Nick Piggin <nickpiggin@...oo.com.au>, Ingo Molnar <mingo@...e.hu>,
<linux-kernel@...r.kernel.org>
Subject: [PATCH] sched debug: Cleanup the sysctl registration code.
- Use C99 initializers (struct ctl_table may change again)
- We don't need to set ctl_name anywhere to anything besides CTL_UNNUMBERED
- memset after kmalloc isn't needed if we just use kzalloc
- Directories under /proc/sys should always be 0555.
User space programs can not write to them.
Cc: Nick Piggin <nickpiggin@...oo.com.au>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
kernel/sched.c | 56 ++++++++++++++++++++++++++++++++------------------------
1 files changed, 32 insertions(+), 24 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index 72bb948..77dfdb2 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5210,32 +5210,40 @@ static void migrate_dead_tasks(unsigned int dead_cpu)
#if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_SYSCTL)
static struct ctl_table sd_ctl_dir[] = {
- {CTL_UNNUMBERED, "sched_domain", NULL, 0, 0755, NULL, },
- {0,},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "sched_domain",
+ .mode = 0555,
+ },
+ {}
};
static struct ctl_table sd_ctl_root[] = {
- {CTL_UNNUMBERED, "kernel", NULL, 0, 0755, sd_ctl_dir, },
- {0,},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "kernel",
+ .mode = 0555,
+ .child = sd_ctl_dir,
+ },
+ {}
};
static struct ctl_table *sd_alloc_ctl_entry(int n)
{
struct ctl_table *entry =
- kmalloc(n * sizeof(struct ctl_table), GFP_KERNEL);
+ kzalloc(n * sizeof(struct ctl_table), GFP_KERNEL);
BUG_ON(!entry);
- memset(entry, 0, n * sizeof(struct ctl_table));
return entry;
}
static void
-set_table_entry(struct ctl_table *entry, int ctl_name,
+set_table_entry(struct ctl_table *entry,
const char *procname, void *data, int maxlen,
mode_t mode, proc_handler *proc_handler)
{
- entry->ctl_name = ctl_name;
+ entry->ctl_name = CTL_UNNUMBERED;
entry->procname = procname;
entry->data = data;
entry->maxlen = maxlen;
@@ -5248,34 +5256,34 @@ sd_alloc_ctl_domain_table(struct sched_domain *sd)
{
struct ctl_table *table = sd_alloc_ctl_entry(14);
- set_table_entry(&table[0], 1, "min_interval", &sd->min_interval,
+ set_table_entry(&table[0], "min_interval", &sd->min_interval,
sizeof(long), 0644, proc_doulongvec_minmax);
- set_table_entry(&table[1], 2, "max_interval", &sd->max_interval,
+ set_table_entry(&table[1], "max_interval", &sd->max_interval,
sizeof(long), 0644, proc_doulongvec_minmax);
- set_table_entry(&table[2], 3, "busy_idx", &sd->busy_idx,
+ set_table_entry(&table[2], "busy_idx", &sd->busy_idx,
sizeof(int), 0644, proc_dointvec_minmax);
- set_table_entry(&table[3], 4, "idle_idx", &sd->idle_idx,
+ set_table_entry(&table[3], "idle_idx", &sd->idle_idx,
sizeof(int), 0644, proc_dointvec_minmax);
- set_table_entry(&table[4], 5, "newidle_idx", &sd->newidle_idx,
+ set_table_entry(&table[4], "newidle_idx", &sd->newidle_idx,
sizeof(int), 0644, proc_dointvec_minmax);
- set_table_entry(&table[5], 6, "wake_idx", &sd->wake_idx,
+ set_table_entry(&table[5], "wake_idx", &sd->wake_idx,
sizeof(int), 0644, proc_dointvec_minmax);
- set_table_entry(&table[6], 7, "forkexec_idx", &sd->forkexec_idx,
+ set_table_entry(&table[6], "forkexec_idx", &sd->forkexec_idx,
sizeof(int), 0644, proc_dointvec_minmax);
- set_table_entry(&table[7], 8, "busy_factor", &sd->busy_factor,
+ set_table_entry(&table[7], "busy_factor", &sd->busy_factor,
sizeof(int), 0644, proc_dointvec_minmax);
- set_table_entry(&table[8], 9, "imbalance_pct", &sd->imbalance_pct,
+ set_table_entry(&table[8], "imbalance_pct", &sd->imbalance_pct,
sizeof(int), 0644, proc_dointvec_minmax);
- set_table_entry(&table[10], 11, "cache_nice_tries",
+ set_table_entry(&table[10], "cache_nice_tries",
&sd->cache_nice_tries,
sizeof(int), 0644, proc_dointvec_minmax);
- set_table_entry(&table[12], 13, "flags", &sd->flags,
+ set_table_entry(&table[12], "flags", &sd->flags,
sizeof(int), 0644, proc_dointvec_minmax);
return table;
}
-static ctl_table *sd_alloc_ctl_cpu_table(int cpu)
+static struct ctl_table *sd_alloc_ctl_cpu_table(int cpu)
{
struct ctl_table *entry, *table;
struct sched_domain *sd;
@@ -5289,9 +5297,9 @@ static ctl_table *sd_alloc_ctl_cpu_table(int cpu)
i = 0;
for_each_domain(cpu, sd) {
snprintf(buf, 32, "domain%d", i);
- entry->ctl_name = i + 1;
+ entry->ctl_name = CTL_UNNUMBERED;
entry->procname = kstrdup(buf, GFP_KERNEL);
- entry->mode = 0755;
+ entry->mode = 0555;
entry->child = sd_alloc_ctl_domain_table(sd);
entry++;
i++;
@@ -5310,9 +5318,9 @@ static void init_sched_domain_sysctl(void)
for (i = 0; i < cpu_num; i++, entry++) {
snprintf(buf, 32, "cpu%d", i);
- entry->ctl_name = i + 1;
+ entry->ctl_name = CTL_UNNUMBERED;
entry->procname = kstrdup(buf, GFP_KERNEL);
- entry->mode = 0755;
+ entry->mode = 0555;
entry->child = sd_alloc_ctl_cpu_table(i);
}
sd_sysctl_header = register_sysctl_table(sd_ctl_root);
--
1.5.1.1.181.g2de0
-
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