The patch titled
per task delay accounting taskstats interface: fix early sem init
has been added to the -mm tree. Its filename is
per-task-delay-accounting-taskstats-interface-control-exit-data-through-cpumasks-fix-2.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: per task delay accounting taskstats interface: fix early sem init
From: Shailabh Nagar <nagar@xxxxxxxxxxxxxx>
Shift initialization of semaphores taken on exit() path to earlier in the
bootup sequence. Without this fix, booting on large cpu machines hangs at
down_read() called on one of the per-cpu semaphores declared in taskstats.
Signed-off-by: Shailabh Nagar <nagar@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
kernel/taskstats.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff -puN kernel/taskstats.c~per-task-delay-accounting-taskstats-interface-control-exit-data-through-cpumasks-fix-2 kernel/taskstats.c
--- a/kernel/taskstats.c~per-task-delay-accounting-taskstats-interface-control-exit-data-through-cpumasks-fix-2
+++ a/kernel/taskstats.c
@@ -501,15 +501,20 @@ static struct genl_ops taskstats_ops = {
/* Needed early in initialization */
void __init taskstats_init_early(void)
{
+ unsigned int i;
+
taskstats_cache = kmem_cache_create("taskstats_cache",
sizeof(struct taskstats),
0, SLAB_PANIC, NULL, NULL);
+ for_each_possible_cpu(i) {
+ INIT_LIST_HEAD(&(per_cpu(listener_array, i).list));
+ init_rwsem(&(per_cpu(listener_array, i).sem));
+ }
}
static int __init taskstats_init(void)
{
int rc;
- unsigned int i;
rc = genl_register_family(&family);
if (rc)
@@ -519,11 +524,6 @@ static int __init taskstats_init(void)
if (rc < 0)
goto err;
- for_each_possible_cpu(i) {
- INIT_LIST_HEAD(&(per_cpu(listener_array, i).list));
- init_rwsem(&(per_cpu(listener_array, i).sem));
- }
-
family_registered = 1;
return 0;
err:
_
Patches currently in -mm which might be from nagar@xxxxxxxxxxxxxx are
netlink-improve-string-attribute-validation.patch
list_islast-utility.patch
per-task-delay-accounting-setup.patch
per-task-delay-accounting-sync-block-i-o-and-swapin-delay-collection.patch
per-task-delay-accounting-cpu-delay-collection-via-schedstats.patch
per-task-delay-accounting-utilities-for-genetlink-usage.patch
per-task-delay-accounting-taskstats-interface.patch
per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface.patch
per-task-delay-accounting-documentation.patch
per-task-delay-accounting-proc-export-of-aggregated-block-i-o-delays.patch
delay-accounting-taskstats-interface-send-tgid-once.patch
per-task-delay-accounting-avoid-send-without-listeners.patch
per-task-delay-accounting-taskstats-interface-control-exit-data-through-cpumasks.patch
per-task-delay-accounting-taskstats-interface-control-exit-data-through-cpumasks-fix.patch
per-task-delay-accounting-taskstats-interface-control-exit-data-through-cpumasks-fix-2.patch
per-task-delay-accounting-taskstats-interface-control-exit-data-through-cpumasks-fix-cleanup.patch
per-task-delay-accounting-taskstats-interface-documentation-fix.patch
per-task-delay-accounting-taskstats-interface-fix-drop-listener-only-on-socket-close.patch
per-task-delay-accounting-taskstats-interface-fix-clone-skbs-for-each-listener.patch
task-watchers-register-per-task-delay-accounting.patch
-
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