This is the first step (of two) in removing the kill_pgrp_info.
All the users of this function are in kernel/signal.c, but all
they need is to call __kill_pgrp_info() with the tasklist_lock
read-locked.
Fortunately, one of its users is the kill_something_info(),
which already needs this lock in one of its branches, so clean
these branches up and call the __kill_pgrp_info() directly.
Based on Oleg's view of how this function should look.
Changes from v1:
* Fixed double rcu_read_lock() in the if (pid > 0) branch.
This caused udev die from segfault on FC3, as noticed by Andrew.
Signed-off-by: Oleg Nesterov <[EMAIL PROTECTED]>
Signed-off-by: Pavel Emelyanov <[EMAIL PROTECTED]>
---
kernel/signal.c | 26 +++++++++++++++-----------
1 files changed, 15 insertions(+), 11 deletions(-)
diff --git a/kernel/signal.c b/kernel/signal.c
index cc45a6b..a805c74 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1134,14 +1134,22 @@ EXPORT_SYMBOL_GPL(kill_pid_info_as_uid);
static int kill_something_info(int sig, struct siginfo *info, int pid)
{
int ret;
- rcu_read_lock();
- if (!pid) {
- ret = kill_pgrp_info(sig, info, task_pgrp(current));
- } else if (pid == -1) {
+
+ if (pid > 0) {
+ rcu_read_lock();
+ ret = kill_pid_info(sig, info, find_vpid(pid));
+ rcu_read_unlock();
+ return ret;
+ }
+
+ read_lock(&tasklist_lock);
+ if (pid != -1) {
+ ret = __kill_pgrp_info(sig, info,
+ pid ? find_vpid(-pid) : task_pgrp(current));
+ } else {
int retval = 0, count = 0;
struct task_struct * p;
- read_lock(&tasklist_lock);
for_each_process(p) {
if (p->pid > 1 && !same_thread_group(p, current)) {
int err = group_send_sig_info(sig, info, p);
@@ -1150,14 +1158,10 @@ static int kill_something_info(int sig, struct siginfo
*info, int pid)
retval = err;
}
}
- read_unlock(&tasklist_lock);
ret = count ? retval : -ESRCH;
- } else if (pid < 0) {
- ret = kill_pgrp_info(sig, info, find_vpid(-pid));
- } else {
- ret = kill_pid_info(sig, info, find_vpid(pid));
}
- rcu_read_unlock();
+ read_unlock(&tasklist_lock);
+
return ret;
}
--
1.5.3.4
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