Subject: mm: Enable SLUB for RT
From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 25 Oct 2012 10:32:35 +0100
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
Git-commit: da77ceac3d20f27310a07a7c346a4ee6b40d6c28
Patch-mainline: Queued in subsystem maintainer repository
References: SLE Realtime Extension

Avoid the memory allocation in IRQ section

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[bigeasy: factor out everything except the kcalloc() workaorund ]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Daniel Wagner <dwagner@suse.de>
---
 mm/slub.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3730,6 +3730,11 @@ static void list_slab_objects(struct kme
 							const char *text)
 {
 #ifdef CONFIG_SLUB_DEBUG
+#ifdef CONFIG_PREEMPT_RT
+	/* XXX move out of irq-off section */
+	slab_err(s, page, text, s->name);
+#else
+
 	void *addr = page_address(page);
 	void *p;
 	unsigned long *map = bitmap_zalloc(page->objects, GFP_ATOMIC);
@@ -3749,8 +3754,10 @@ static void list_slab_objects(struct kme
 	slab_unlock(page);
 	bitmap_free(map);
 #endif
+#endif
 }
 
+
 /*
  * Attempt to free all partial slabs on a node.
  * This is called from __kmem_cache_shutdown(). We must take list_lock