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authorOleg Nesterov <oleg@tv-sign.ru>2006-09-29 02:00:25 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 09:18:14 -0700
commitbce9a234ce7d8dddbfcec28e37ea58b5d8f6003d (patch)
treec5bdbedb08abab4673f1cdab12b7358facc247db
parent486ccb05fdbb7ca79784fdf0d07d2a86de48cf05 (diff)
[PATCH] elf_fdpic_core_dump: don't take tasklist_lock
do_each_thread() is rcu-safe, and all tasks which use this ->mm must sleep in wait_for_completion(&mm->core_done) at this point, so we can use RCU locks. Also, remove unneeded INIT_LIST_HEAD(new) before list_add(new, head). Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Acked-By: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--fs/binfmt_elf_fdpic.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 2f336582922..f86d5c9ce5e 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1597,20 +1597,19 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
if (signr) {
struct elf_thread_status *tmp;
- read_lock(&tasklist_lock);
+ rcu_read_lock();
do_each_thread(g,p)
if (current->mm == p->mm && current != p) {
tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC);
if (!tmp) {
- read_unlock(&tasklist_lock);
+ rcu_read_unlock();
goto cleanup;
}
- INIT_LIST_HEAD(&tmp->list);
tmp->thread = p;
list_add(&tmp->list, &thread_list);
}
while_each_thread(g,p);
- read_unlock(&tasklist_lock);
+ rcu_read_unlock();
list_for_each(t, &thread_list) {
struct elf_thread_status *tmp;
int sz;