Commit 2bf1acc2 authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Paul E. McKenney
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uprobes: Use DEFINE_STATIC_PERCPU_RWSEM() to initialize dup_mmap_sem 



Use DEFINE_STATIC_PERCPU_RWSEM() to initialize dup_mmap_sem.

Signed-off-by: default avatarOleg Nesterov <oleg@redhat.com>
Reviewed-by: default avatarIngo Molnar <mingo@kernel.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.ibm.com>
parent 95bf33b5

kernel/events/uprobes.c

+1 −3
Original line number Diff line number Diff line
@@ -46,7 +46,7 @@ static DEFINE_SPINLOCK(uprobes_treelock); /* serialize rbtree access */ 
static struct mutex uprobes_mmap_mutex[UPROBES_HASH_SZ];

#define uprobes_mmap_hash(v)	(&uprobes_mmap_mutex[((unsigned long)(v)) % UPROBES_HASH_SZ])



static struct percpu_rw_semaphore dup_mmap_sem;

DEFINE_STATIC_PERCPU_RWSEM(dup_mmap_sem);



/* Have a copy of original instruction */

#define UPROBE_COPY_INSN	0
@@ -2302,7 +2302,5 @@ void __init uprobes_init(void) 
	for (i = 0; i < UPROBES_HASH_SZ; i++)

		mutex_init(&uprobes_mmap_mutex[i]);



	BUG_ON(percpu_init_rwsem(&dup_mmap_sem));



	BUG_ON(register_die_notifier(&uprobe_exception_nb));

}