From 94db5b5c0cfd8c5e5afbb9d61349434df1eda3dc Mon Sep 17 00:00:00 2001
Message-Id: <94db5b5c0cfd8c5e5afbb9d61349434df1eda3dc.1592846147.git.zanussi@kernel.org>
In-Reply-To: <07cd0dbc80b976663c80755496a03f288decfe5a.1592846146.git.zanussi@kernel.org>
References: <07cd0dbc80b976663c80755496a03f288decfe5a.1592846146.git.zanussi@kernel.org>
From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 25 Oct 2012 10:32:35 +0100
Subject: [PATCH 081/330] mm: Enable SLUB for RT
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.127-rt55.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(+)

diff --git a/mm/slub.c b/mm/slub.c
index 7a0706ccdf30..f3fcb9502093 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3699,6 +3699,11 @@ static void list_slab_objects(struct kmem_cache *s, struct page *page,
 							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),
@@ -3720,6 +3725,7 @@ static void list_slab_objects(struct kmem_cache *s, struct page *page,
 	slab_unlock(page);
 	kfree(map);
 #endif
+#endif
 }
 
 /*
-- 
2.17.1

