diff options
| author |   Keshavamurthy Anil S <anil.s.keshavamurthy@intel.com> | 2006-01-09 20:52:44 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-10 08:01:40 -0800 |
| commit | f709b122343fb9a010b6cf2d5559641f1820f7c9 (patch) | |
| tree | 5019515d4debd995570ffd35b6311fdd26456306 /kernel | |
| parent | [PATCH] kprobes: changed from using spinlock to mutex (diff) | |
| download | linux-dev-f709b122343fb9a010b6cf2d5559641f1820f7c9.tar.xz linux-dev-f709b122343fb9a010b6cf2d5559641f1820f7c9.zip | |
[PATCH] kprobes-changed-from-using-spinlock-to-mutex fix
Based on some feedback from Oleg Nesterov, I have made few changes to
previously posted patch.
Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/kprobes.c | 32 |
1 files changed, 18 insertions, 14 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c index f14ccd35e9b6..f1c0e61a2cb4 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -431,7 +431,7 @@ static int __kprobes register_aggr_kprobe(struct kprobe *old_p, copy_kprobe(old_p, p); ret = add_new_kprobe(old_p, p); } else { - ap = kcalloc(1, sizeof(struct kprobe), GFP_ATOMIC); + ap = kcalloc(1, sizeof(struct kprobe), GFP_KERNEL); if (!ap) return -ENOMEM; add_aggr_kprobe(ap, old_p); @@ -491,7 +491,8 @@ out: void __kprobes unregister_kprobe(struct kprobe *p) { struct module *mod; - struct kprobe *old_p, *cleanup_p; + struct kprobe *old_p, *list_p; + int cleanup_p; down(&kprobe_mutex); old_p = get_kprobe(p->addr); @@ -499,22 +500,25 @@ void __kprobes unregister_kprobe(struct kprobe *p) up(&kprobe_mutex); return; } - - if ((old_p->pre_handler == aggr_pre_handler) && + if (p != old_p) { + list_for_each_entry_rcu(list_p, &old_p->list, list) + if (list_p == p) + /* kprobe p is a valid probe */ + goto valid_p; + up(&kprobe_mutex); + return; + } +valid_p: + if ((old_p == p) || ((old_p->pre_handler == aggr_pre_handler) && (p->list.next == &old_p->list) && - (p->list.prev == &old_p->list)) { - /* Only one element in the aggregate list */ + (p->list.prev == &old_p->list))) { + /* Only probe on the hash list */ arch_disarm_kprobe(p); hlist_del_rcu(&old_p->hlist); - cleanup_p = old_p; - } else if (old_p == p) { - /* Only one kprobe element in the hash list */ - arch_disarm_kprobe(p); - hlist_del_rcu(&p->hlist); - cleanup_p = p; + cleanup_p = 1; } else { list_del_rcu(&p->list); - cleanup_p = NULL; + cleanup_p = 0; } up(&kprobe_mutex); @@ -524,7 +528,7 @@ void __kprobes unregister_kprobe(struct kprobe *p) module_put(mod); if (cleanup_p) { - if (cleanup_p->pre_handler == aggr_pre_handler) { + if (p != old_p) { list_del_rcu(&p->list); kfree(old_p); } |