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authorMasami Hiramatsu <mhiramat@redhat.com>2009-06-30 17:08:09 -0400
committerIngo Molnar <mingo@elte.hu>2009-07-01 10:43:07 +0200
commit4a2bb6fcc80e6330ca2f2393e98605052cc7780b (patch)
tree3e1d2314d7002f13bb61ff78266cce3922673c93 /kernel/kprobes.c
parent238a24f626628cb16a3015f332d649f08246ca89 (diff)
downloadlinux-2.6.34-ux500-4a2bb6fcc80e6330ca2f2393e98605052cc7780b.tar.gz
kprobes: No need to unlock kprobe_insn_mutex
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>
Diffstat (limited to 'kernel/kprobes.c')
-rw-r--r--kernel/kprobes.c6
1 files changed, 1 insertions, 5 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index c0fa54b276d..16b5739c516 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -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) {