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Subject[PATCH] uprobes: use DEFINE_STATIC_PERCPU_RWSEM() to initialize dup_mmap_sem
Use DEFINE_STATIC_PERCPU_RWSEM() to initialize dup_mmap_sem.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
kernel/events/uprobes.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index c5cde87..76c7380 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -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
@@ -2301,9 +2301,6 @@ static int __init init_uprobes(void)
for (i = 0; i < UPROBES_HASH_SZ; i++)
mutex_init(&uprobes_mmap_mutex[i]);

- if (percpu_init_rwsem(&dup_mmap_sem))
- return -ENOMEM;
-
return register_die_notifier(&uprobe_exception_nb);
}
__initcall(init_uprobes);
--
2.5.0

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