linux-kernel - [PATCH] uprobes: use DEFINE_STATIC_PERCPU_RWSEM() to initialize dup_mmap

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Date:   Tue, 23 Apr 2019 17:21:02 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org
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@...hat.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