The patch titled
Subject: pid-replace-pid-bitmap-implementation-with-idr-api-v6
has been added to the -mm tree. Its filename is
pid-replace-pid-bitmap-implementation-with-idr-api-v6.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/pid-replace-pid-bitmap-implementation-with-idr-api-v6.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/pid-replace-pid-bitmap-implementation-with-idr-api-v6.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Gargi Sharma <gs051095@xxxxxxxxx>
Subject: pid-replace-pid-bitmap-implementation-with-idr-api-v6
Link: http://lkml.kernel.org/r/1507760379-21662-2-git-send-email-gs051095@xxxxxxxxx
Signed-off-by: Gargi Sharma <gs051095@xxxxxxxxx>
Cc: Julia Lawall <julia.lawall@xxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/pid.c | 6 ++++--
kernel/pid_namespace.c | 2 ++
2 files changed, 6 insertions(+), 2 deletions(-)
diff -puN kernel/pid.c~pid-replace-pid-bitmap-implementation-with-idr-api-v6 kernel/pid.c
--- a/kernel/pid.c~pid-replace-pid-bitmap-implementation-with-idr-api-v6
+++ a/kernel/pid.c
@@ -124,7 +124,7 @@ void free_pid(struct pid *pid)
struct upid *upid = pid->numbers + i;
struct pid_namespace *ns = upid->ns;
hlist_del_rcu(&upid->pid_chain);
- switch(--ns->nr_hashed) {
+ switch (--ns->nr_hashed) {
case 2:
case 1:
/* When all that is left in the pid namespace
@@ -168,6 +168,7 @@ struct pid *alloc_pid(struct pid_namespa
for (i = ns->level; i >= 0; i--) {
int pid_min = 1;
+
idr_preload(GFP_KERNEL);
spin_lock_irq(&pidmap_lock);
@@ -178,7 +179,8 @@ struct pid *alloc_pid(struct pid_namespa
if (idr_get_cursor(&tmp->idr) > RESERVED_PIDS)
pid_min = RESERVED_PIDS;
- /* Store a null pointer so find_pid_ns does not find *
+ /*
+ * Store a null pointer so find_pid_ns does not find
* a partially initialized PID (see below).
*/
nr = idr_alloc_cyclic(&tmp->idr, NULL, pid_min,
diff -puN kernel/pid_namespace.c~pid-replace-pid-bitmap-implementation-with-idr-api-v6 kernel/pid_namespace.c
--- a/kernel/pid_namespace.c~pid-replace-pid-bitmap-implementation-with-idr-api-v6
+++ a/kernel/pid_namespace.c
@@ -229,6 +229,7 @@ void zap_pid_ns_processes(struct pid_nam
* maintain a tasklist for each pid namespace.
*
*/
+ rcu_read_lock();
read_lock(&tasklist_lock);
nr = 2;
idr_for_each_entry_continue(&pid_ns->idr, pid, nr) {
@@ -237,6 +238,7 @@ void zap_pid_ns_processes(struct pid_nam
send_sig_info(SIGKILL, SEND_SIG_FORCED, task);
}
read_unlock(&tasklist_lock);
+ rcu_read_unlock();
/*
* Reap the EXIT_ZOMBIE children we had before we ignored SIGCHLD.
_
Patches currently in -mm which might be from gs051095@xxxxxxxxx are
pid-replace-pid-bitmap-implementation-with-idr-api.patch
pid-replace-pid-bitmap-implementation-with-idr-api-v6.patch
pid-remove-pidhash.patch
pid-remove-pidhash-v6.patch
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