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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2006-09-29 02:00:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-29 09:18:14 -0700 |
| commit | bce9a234ce7d8dddbfcec28e37ea58b5d8f6003d (patch) | |
| tree | c5bdbedb08abab4673f1cdab12b7358facc247db | |
| parent | 486ccb05fdbb7ca79784fdf0d07d2a86de48cf05 (diff) | |
| download | lwn-bce9a234ce7d8dddbfcec28e37ea58b5d8f6003d.tar.gz lwn-bce9a234ce7d8dddbfcec28e37ea58b5d8f6003d.zip | |
[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.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c index 2f3365829229..f86d5c9ce5eb 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; |