The patch titled
kill_pid_info: kill acquired_tasklist_lock
has been added to the -mm tree. Its filename is
kill_pid_info-kill-acquired_tasklist_lock.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: kill_pid_info: kill acquired_tasklist_lock
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Kill acquired_tasklist_lock, sig_needs_tasklist() is very cheap nowadays.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
kernel/signal.c | 9 ++++-----
1 files changed, 4 insertions(+), 5 deletions(-)
diff -puN kernel/signal.c~kill_pid_info-kill-acquired_tasklist_lock kernel/signal.c
--- a/kernel/signal.c~kill_pid_info-kill-acquired_tasklist_lock
+++ a/kernel/signal.c
@@ -1119,19 +1119,18 @@ kill_pg_info(int sig, struct siginfo *in
int kill_pid_info(int sig, struct siginfo *info, struct pid *pid)
{
int error;
- int acquired_tasklist_lock = 0;
struct task_struct *p;
rcu_read_lock();
- if (unlikely(sig_needs_tasklist(sig))) {
+ if (unlikely(sig_needs_tasklist(sig)))
read_lock(&tasklist_lock);
- acquired_tasklist_lock = 1;
- }
+
p = pid_task(pid, PIDTYPE_PID);
error = -ESRCH;
if (p)
error = group_send_sig_info(sig, info, p);
- if (unlikely(acquired_tasklist_lock))
+
+ if (unlikely(sig_needs_tasklist(sig)))
read_unlock(&tasklist_lock);
rcu_read_unlock();
return error;
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
origin.patch
doc-atomic_add_unless-doesnt-imply-mb-on-failure.patch
vt-refactor-console-sak-processing.patch
procfs-fix-race-between-proc_readdir-and-remove_proc_entry.patch
procfs-fix-race-between-proc_readdir-and-remove_proc_entry-fix.patch
kill_pid_info-kill-acquired_tasklist_lock.patch
tty-make-__proc_set_tty-static.patch
tty-clarify-disassociate_ctty.patch
tty-fix-the-locking-for-signal-session-in-disassociate_ctty.patch
signal-use-kill_pgrp-not-kill_pg-in-the-sunos-compatibility-code.patch
signal-rewrite-kill_something_info-so-it-uses-newer-helpers.patch
pid-make-session_of_pgrp-use-struct-pid-instead-of-pid_t.patch
pid-use-struct-pid-for-talking-about-process-groups-in-exitc.patch
pid-replace-is_orphaned_pgrp-with-is_current_pgrp_orphaned.patch
tty-update-the-tty-layer-to-work-with-struct-pid.patch
pid-replace-do-while_each_task_pid-with-do-while_each_pid_task.patch
pid-remove-now-unused-do_each_task_pid-and-while_each_task_pid.patch
pid-remove-the-now-unused-kill_pg-kill_pg_info-and-__kill_pg_info.patch
-
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