-add /proc/sys/debug/pr_debug, to toggle pr_debug() on/off
Signed-off-by: Jason Baron <jbaron@redhat.com>
---
kernel/sysctl.c | 41 +++++++++++++++++++++++++++++++++++++++++
1 files changed, 41 insertions(+), 0 deletions(-)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 7cb1ac3..73508d7 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -155,6 +155,11 @@ static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp
static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos);
#endif
+#ifdef CONFIG_PR_DEBUG_DYNAMIC
+static int proc_pr_debug_handler(struct ctl_table *table, int write,
+ struct file *filp, void __user *buffer,
+ size_t *lenp, loff_t *ppos);
+#endif
static struct ctl_table root_table[];
static struct ctl_table_root sysctl_table_root;
@@ -1312,6 +1317,16 @@ static struct ctl_table debug_table[] = {
.proc_handler = proc_dointvec
},
#endif
+#ifdef CONFIG_PR_DEBUG_DYNAMIC
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "pr_debug",
+ .data = NULL,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_pr_debug_handler
+ },
+#endif
{ .ctl_name = 0 }
};
@@ -2499,6 +2514,32 @@ static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp
return 0;
}
+#ifdef CONFIG_PR_DEBUG_DYNAMIC
+
+static int proc_pr_debug_handler(struct ctl_table *table, int write,
+ struct file *filp, void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ int tmp, r;
+
+ if (!write)
+ tmp = imv_read(pr_debug_on);
+ r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
+ lenp, ppos, NULL, NULL);
+ if (r)
+ return r;
+
+ if (write) {
+ if (tmp)
+ imv_set(pr_debug_on, 1);
+ else
+ imv_set(pr_debug_on, 0);
+ }
+ return 0;
+}
+
+#endif
+
#else /* CONFIG_PROC_FS */
int proc_dostring(struct ctl_table *table, int write, struct file *filp,
--
