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Groups > linux.kernel > #1200340

[PATCH RT 1/7] Revert "slub: delay ctor until the object is requested"

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3.18.18-rt16-rc1 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

This approach is broken with SLAB_DESTROY_BY_RCU allocations.
Reported by Steven Rostedt and Koehrer Mathias.

Cc: stable-rt@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 mm/slub.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 72bb06beaabc..534609a0326a 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1376,10 +1376,8 @@ static void setup_object(struct kmem_cache *s, struct page *page,
 				void *object)
 {
 	setup_object_debug(s, page, object);
-#ifndef CONFIG_PREEMPT_RT_FULL
 	if (unlikely(s->ctor))
 		s->ctor(object);
-#endif
 }
 
 static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
@@ -2501,10 +2499,6 @@ redo:
 
 	if (unlikely(gfpflags & __GFP_ZERO) && object)
 		memset(object, 0, s->object_size);
-#ifdef CONFIG_PREEMPT_RT_FULL
-	if (unlikely(s->ctor) && object)
-		s->ctor(object);
-#endif
 
 	slab_post_alloc_hook(s, gfpflags, object);
 
-- 
2.1.4


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[PATCH RT 0/7] Linux 3.18.18-rt16-rc1 Steven Rostedt <rostedt@goodmis.org> - 2015-08-05 03:20 +0200
  [PATCH RT 7/7] Linux 3.18.18-rt16-rc1 Steven Rostedt <rostedt@goodmis.org> - 2015-08-05 03:20 +0200
  [PATCH RT 3/7] sched: Implement lockless wake-queues Steven Rostedt <rostedt@goodmis.org> - 2015-08-05 03:20 +0200
  [PATCH RT 4/7] futex: Implement lockless wakeups Steven Rostedt <rostedt@goodmis.org> - 2015-08-05 03:30 +0200
  [PATCH RT 1/7] Revert "slub: delay ctor until the object is requested" Steven Rostedt <rostedt@goodmis.org> - 2015-08-05 03:30 +0200
  [PATCH RT 5/7] ipc/mqueue: Implement lockless pipelined wakeups Steven Rostedt <rostedt@goodmis.org> - 2015-08-05 03:30 +0200
  [PATCH RT 2/7] mm/slub: move slab initialization into irq enabled region Steven Rostedt <rostedt@goodmis.org> - 2015-08-05 03:30 +0200
    Re: [PATCH RT 2/7] mm/slub: move slab initialization into irq  enabled region Mike Galbraith <umgwanakikbuti@gmail.com> - 2015-08-10 08:40 +0200
  Re: [PATCH RT 0/7] Linux 3.18.18-rt16-rc1 "Wolfgang M. Reimer" <linuxball@gmail.com> - 2015-08-07 10:50 +0200
    Re: [PATCH RT 0/7] Linux 3.18.18-rt16-rc1 Steven Rostedt <rostedt@goodmis.org> - 2015-08-07 15:50 +0200

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