[PATCH] Kprobes: Use RCU for (un)register synchronization - base changes
Changes to the base kprobes infrastructure to use RCU for synchronization
during kprobe registration and unregistration. These changes coupled with the
arch kprobe changes (next in series):
a. serialize registration and unregistration of kprobes.
b. enable lockless execution of handlers. Handlers can now run in parallel.
Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 6720305..cff281c 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -34,6 +34,8 @@
#include <linux/notifier.h>
#include <linux/smp.h>
#include <linux/percpu.h>
+#include <linux/spinlock.h>
+#include <linux/rcupdate.h>
#include <asm/kprobes.h>
@@ -146,10 +148,7 @@
};
#ifdef CONFIG_KPROBES
-/* Locks kprobe: irq must be disabled */
-void lock_kprobes(void);
-void unlock_kprobes(void);
-
+extern spinlock_t kretprobe_lock;
extern int arch_prepare_kprobe(struct kprobe *p);
extern void arch_copy_kprobe(struct kprobe *p);
extern void arch_arm_kprobe(struct kprobe *p);
@@ -160,7 +159,7 @@
extern kprobe_opcode_t *get_insn_slot(void);
extern void free_insn_slot(kprobe_opcode_t *slot);
-/* Get the kprobe at this addr (if any). Must have called lock_kprobes */
+/* Get the kprobe at this addr (if any) - called under a rcu_read_lock() */
struct kprobe *get_kprobe(void *addr);
struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);