kprobes: rename kprobe_enabled to kprobes_all_disarmed
Masami Hiramatsu [Tue, 7 Apr 2009 02:01:01 +0000 (19:01 -0700)]
Rename kprobe_enabled to kprobes_all_disarmed and invert logic due to
avoiding naming confusion from per-probe disabling.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/kprobes.c

index ca4c22d..dae198b 100644 (file)
@@ -68,7 +68,7 @@ static struct hlist_head kprobe_table[KPROBE_TABLE_SIZE];
 static struct hlist_head kretprobe_inst_table[KPROBE_TABLE_SIZE];
 
 /* NOTE: change this value only with kprobe_mutex held */
-static bool kprobe_enabled;
+static bool kprobes_all_disarmed;
 
 static DEFINE_MUTEX(kprobe_mutex);     /* Protects kprobe_table */
 static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL;
@@ -598,7 +598,7 @@ static int __kprobes register_aggr_kprobe(struct kprobe *old_p,
                 * If the old_p has gone, its breakpoint has been disarmed.
                 * We have to arm it again after preparing real kprobes.
                 */
-               if (kprobe_enabled)
+               if (!kprobes_all_disarmed)
                        arch_arm_kprobe(ap);
        }
 
@@ -709,7 +709,7 @@ int __kprobes register_kprobe(struct kprobe *p)
        hlist_add_head_rcu(&p->hlist,
                       &kprobe_table[hash_ptr(p->addr, KPROBE_HASH_BITS)]);
 
-       if (kprobe_enabled)
+       if (!kprobes_all_disarmed)
                arch_arm_kprobe(p);
 
 out_unlock_text:
@@ -751,7 +751,7 @@ valid_p:
                 * enabled and not gone - otherwise, the breakpoint would
                 * already have been removed. We save on flushing icache.
                 */
-               if (kprobe_enabled && !kprobe_gone(old_p)) {
+               if (!kprobes_all_disarmed && !kprobe_gone(old_p)) {
                        mutex_lock(&text_mutex);
                        arch_disarm_kprobe(p);
                        mutex_unlock(&text_mutex);
@@ -1190,8 +1190,8 @@ static int __init init_kprobes(void)
                }
        }
 
-       /* By default, kprobes are enabled */
-       kprobe_enabled = true;
+       /* By default, kprobes are armed */
+       kprobes_all_disarmed = false;
 
        err = arch_init_kprobes();
        if (!err)
@@ -1289,7 +1289,7 @@ static struct file_operations debugfs_kprobes_operations = {
        .release        = seq_release,
 };
 
-static void __kprobes enable_all_kprobes(void)
+static void __kprobes arm_all_kprobes(void)
 {
        struct hlist_head *head;
        struct hlist_node *node;
@@ -1298,8 +1298,8 @@ static void __kprobes enable_all_kprobes(void)
 
        mutex_lock(&kprobe_mutex);
 
-       /* If kprobes are already enabled, just return */
-       if (kprobe_enabled)
+       /* If kprobes are armed, just return */
+       if (!kprobes_all_disarmed)
                goto already_enabled;
 
        mutex_lock(&text_mutex);
@@ -1311,7 +1311,7 @@ static void __kprobes enable_all_kprobes(void)
        }
        mutex_unlock(&text_mutex);
 
-       kprobe_enabled = true;
+       kprobes_all_disarmed = false;
        printk(KERN_INFO "Kprobes globally enabled\n");
 
 already_enabled:
@@ -1319,7 +1319,7 @@ already_enabled:
        return;
 }
 
-static void __kprobes disable_all_kprobes(void)
+static void __kprobes disarm_all_kprobes(void)
 {
        struct hlist_head *head;
        struct hlist_node *node;
@@ -1328,11 +1328,11 @@ static void __kprobes disable_all_kprobes(void)
 
        mutex_lock(&kprobe_mutex);
 
-       /* If kprobes are already disabled, just return */
-       if (!kprobe_enabled)
+       /* If kprobes are already disarmed, just return */
+       if (kprobes_all_disarmed)
                goto already_disabled;
 
-       kprobe_enabled = false;
+       kprobes_all_disarmed = true;
        printk(KERN_INFO "Kprobes globally disabled\n");
        mutex_lock(&text_mutex);
        for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
@@ -1364,7 +1364,7 @@ static ssize_t read_enabled_file_bool(struct file *file,
 {
        char buf[3];
 
-       if (kprobe_enabled)
+       if (!kprobes_all_disarmed)
                buf[0] = '1';
        else
                buf[0] = '0';
@@ -1387,12 +1387,12 @@ static ssize_t write_enabled_file_bool(struct file *file,
        case 'y':
        case 'Y':
        case '1':
-               enable_all_kprobes();
+               arm_all_kprobes();
                break;
        case 'n':
        case 'N':
        case '0':
-               disable_all_kprobes();
+               disarm_all_kprobes();
                break;
        }