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kprobes: No need to unlock kprobe_insn_mutex

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Remove needless kprobe_insn_mutex unlocking during safety check
in garbage collection, because if someone releases a dirty slot
during safety check (which ensures other cpus doesn't execute
all dirty slots), the safety check must be fail. So, we need to
hold the mutex while checking safety.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
LKML-Reference: <20090630210809.17851.28781.stgit@localhost.localdomain>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Masami Hiramatsu 2009-06-30 17:08:09 -04:00 committed by Ingo Molnar
parent 238a24f626
commit 4a2bb6fcc8
1 changed files with 1 additions and 5 deletions
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6
kernel/kprobes.c
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@ -237,13 +237,9 @@ static int __kprobes collect_garbage_slots(void)
{
struct kprobe_insn_page *kip;
struct hlist_node *pos, *next;
int safety;
/* Ensure no-one is preepmted on the garbages */
mutex_unlock(&kprobe_insn_mutex);
safety = check_safety();
mutex_lock(&kprobe_insn_mutex);
if (safety != 0)
if (check_safety())
return -EAGAIN;
hlist_for_each_entry_safe(kip, pos, next, &kprobe_insn_pages, hlist) {