Subject: mm: Enable SLUB for RT
From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 25 Oct 2012 10:32:35 +0100
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.25-rt16.tar.xz

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>
---
 mm/slub.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3677,6 +3677,11 @@ static void list_slab_objects(struct kme
 							const char *text)
 {
 #ifdef CONFIG_SLUB_DEBUG
+#ifdef CONFIG_PREEMPT_RT_BASE
+	/* 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 = kcalloc(BITS_TO_LONGS(page->objects),
@@ -3698,6 +3703,7 @@ static void list_slab_objects(struct kme
 	slab_unlock(page);
 	kfree(map);
 #endif
+#endif
 }
 
 /*
